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SOLVED: "Operation could destabilize the runtime" - ASP.NET 4.5 Hosting

clock October 18, 2012 07:29 by author Administrator

We like to discuss an issue, which normally happens to ASP.NET 4.5 website on Windows Server 2008. We did not spot this issue on Windows Server 2008/Windows Server 2012 and we believe that this issue happens to ASP.NET 4.5 Framework on Windows Server 2008 only. Please note that ASP.NET 4.5 is not supported on Windows Server 2003 or lower.

When you are using Windows Server 2008 and you do make an upgrade of ASP.NET framework to ASP.NET 4.5, your site can stop working with the error message: “Operation could destabilize the runtime

The following is the detail of the error message:

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.  

Exception Details: System.Security.VerificationException: Operation could destabilize the runtime.

To resolve this issue, please kindly make sure the following items are set on your IIS:

1. Please make sure that the ISAPI Filters of your website is set to Revert to Inherited
2. Please make sure that the application pool is running under ASP.NET 4.0 (ASP.NET 4.5 and ASP.NET 4.0 will share the same application pool settings)
3. Please make sure the “Enable 32-bits mode” is set to False

If you are looking to host your
ASP.NET 4.5 website on Windows Server 2012, please have a look at asphostcentral.com

Hope this helps!

 



ASP.NET 4.5 Hosting :: Working with Asynchronous Operations in ASP.NET 4.5 Web Forms

clock September 4, 2012 06:28 by author Administrator

 

Introduction

Asynchronously running code can improve the overall performance and responsiveness of your web application. In ASP.NET 4.5 web forms applications you can register asynchronous methods with the page framework. The ASP.NET page framework and .NET 4.5 asynchronous programming supports then executes the operations in asynchronous fashion. This article shows how this can be done.

NOTE: This article discusses how asynchronous operations can be used in ASP.NET web forms applications. Read Working with Asynchronous Operations in ASP.NET MVC to learn how asynchronous operations can be programed in ASP.NET MVC applications.

If you are looking to host your ASP.NET 4.5 website, you can check out ASPHostCentral.com

 


Example Scenario

Consider that you have a web application that needs to call two ASP.NET Web API services namely Customer and Product. These services return Customer and Product data from the Northwind database respectively. Now, assume that each of these services take 5 seconds to complete the data retrieval operation. If you use synchronous mode for calling these services then the total time taken will be 10 seconds. Because the execution will happen sequentially - first Customer service will complete and then Product service will complete.

On the other hand if you invoke these services in asynchronous fashion, the service operations won't block the caller thread. The Customer service will be invoked and control will be immediately returned to the caller. The caller thread will then proceed to invoke the Product service. So, two operations will be invoked in parallel. In this case the total time taken for completing both of the operations will be the time taken by the longest of the operations (5 seconds in this case).

Async, Await, Task and RegisterAsyncTask

Before developing web forms applications that execute asynchronous operations you need to understand a few basic terms involved in the process.

A task is an operation that is to be executed in asynchronous fashion. Such an operation is programmatically represented by the Task class from System.Threading.Tasks namespace.

When an asynchronous operation begins, the caller thread can continue its work further. However, the caller thread must wait at some point of time for the asynchronous operation to complete. The await keyword invokes an asynchronous operation and waits for it to complete.

The async modifier is applied to a method that is to be invoked asynchronously. Such an asynchronous method typically returns a Task object and has at least one await call inside it.

Just to understand how async, await and task are used at code level, consider the following piece of code:

public async Task<MyObject> MyMethodAsync()
{
  MyObject data = await service.GetDataAsync();
  //other operations on data go here
  return data;
}

Here, method MyMethodAsync() is marked with async modifier. By convention, asynchronous method names end with "Async". The MyMethodAsync() returns MyObject wrapped inside a Task instance. Inside the method a remote service is invoked using GetDataAsync(). Since MyMethodAsync() needs to return data retrieved from the service, the await keyword is used to wait till the GetDataAsync() method returns. Once GetDataAsync() returns the execution is resumed and further code is executed. The data is finally returned to the caller.

NOTE:
For a detailed understanding of async, await and Task refer to MSDN dicumentation. Here, these terms are discussed only for giving a basic understanding of the respective keywords.

ASP.NET page framework provides a method - RegisterAsyncTask() - that registers an asynchronous task with the page framework. Tasks registered using the RegisterAsyncTask() method are invoked immediately after the PreRender event. The RegisterAsyncTask() method takes a parameter of type PageAsyncTask. The PageAsyncTask object wraps the information about an asynchronous task registered with a page. The following piece of code shows how they are used:

protected void Page_Load(object sender, EventArgs e)
{
   PageAsyncTask task = new PageAsyncTask(MyMethod);
   RegisterAsyncTask(task);
}

Asynchronous Solution

Now that you are familiar with the basic concepts involved in utilizing asynchronous operations in a web forms application, let's create a sample application that puts this knowledge to use.

Begin by creating two projects - an empty web forms application and an ASP.NET MVC4 Web API application.

Add an Entity Framework Data Model for the Customers and Products tables of the Northwind database. Place the EF data model inside the Models folder.



Add an Entity Framework Data Model for the Customers and Products tables

Add two ApiController classes to the Web API project and name them as CustomerController and ProductController.



Add two ApiController classes

Then add Get() methods to both the ApiController classes as shown below:

public class CustomerController : ApiController
{
    public IEnumerable<Customer> Get()
    {
        Northwind db = new Northwind();
        var data = from item in db.Customers
                    select item;
        System.Threading.Thread.Sleep(5000);
        return data;
    }
}

public class ProductController : ApiController
{
    public IEnumerable<Product> Get()
    {
        Northwind db = new Northwind();
        var data = from item in db.Products
                    select item;
        System.Threading.Thread.Sleep(5000);
        return data;
    }
}

The Get() method of the CustomerController class selects all the Customer records from the Customers table whereas the Get() method of the ProductController class selects all the Product records. For the sake of testing, a delay of 5 seconds is introduced in each Get() method. The Get() methods return an IEnumerable collection of Customer and Product objects respectively.

Now, go to the web forms project and open the code behind file of the default web form. Here, you will write a couple of private methods that invoke the Web API developed previously. These methods are shown below:

public async Task<List<Customer>> InvokeCustomerService()
{
    using (HttpClient client = new HttpClient())
    {
        HttpResponseMessage response = await client.GetAsync("http://localhost:49187/api/customer");
        string json= (await response.Content.ReadAsStringAsync());
        List<Customer> data = JsonConvert.DeserializeObject<List<Customer>>(json);
        return data;
    }
}

public async Task<List<Product>> InvokeProductService()
{
    using (HttpClient client = new HttpClient())
    {
        HttpResponseMessage response = await client.GetAsync("http://localhost:49187/api/product");
        string json = (await response.Content.ReadAsStringAsync());
        List<Product> data = JsonConvert.DeserializeObject<List<Product>>(json);
        return data;
    }
}

The InvokeCustomerService() method invokes the Customer Web API whereas InvokeProductService() method invokes Product Web API. Both the methods essentially use an HttpClient to get data from the respective Web API. Notice that both the methods have async modifier and return a Task instance that wraps the actual return type (List<Customer> and List<Product> respectively). The GetAsync() method of the HttpClient object is an asynchronous method. Call to the GetAsync() is marked using the await keyword so that further statements are executed only when GetAsync() returns. The GetAsync() method accepts a URL of the respective Web API. Make sure to change the port number as per your development setup. The GetAsync() method returns an HttpResponseMessage object. The actual data is then retrieved using ReadAsStringAsync() method of the Content property. The ReadAsStringAsync() will return data as a JSON string. This JSON data is converted into a .NET generic List using DeserializeObject() method of the JsonConvert class. The JsonConvert class comes from the Json.NET open source componenet. You can download Json.NET here.

The InvokeCustomerService() and InvokeProductService() methods are called inside another private method GetDataFromServicesAsync() as shown below:

private async Task GetDataFromServicesAsync()
{
    Stopwatch stopWatch = new Stopwatch();
    stopWatch.Start();
    var task1 = InvokeCustomerService();
    var task2 = InvokeProductService();
    await Task.WhenAll(task1, task2);

    List<Customer> data1 = task1.Result;
    List<Product> data2 = task2.Result;           

    stopWatch.Stop();
    Label2.Text = string.Format("<h2>Retrieved {0} customers and {1} products in {2} seconds.</h2>",                                  data1.Count, data2.Count, stopWatch.Elapsed.TotalSeconds);
}

As shown above, GetDataFromServicesAsync() is also marked as async and returns a Task instance. Inside, a StopWatch class from System.Diagnostics namespace is used to find the time taken by both of the operations to complete. InvokeCustomerService() and InvokeProductService() methods are then called. The returned Task instance is stored in task1 and task2 variables respectively. The WhenAll() method of Task class creates another Task that completes when all the specified tasks are complete. In this case it creates a Task that completes after complition of task1 and task2. Actual data returned by the respective Web API is retrieved using the Result property of the respective Task objects. The time taken to complete the operation is measured by the StopWatch and is displayed in a Label.

The next step is to register GetDataFromServicesAsync() with the page framework. This is done using the RegisterAsyncTask() method as shown below:

protected void Page_Load(object sender, EventArgs e)
{
    RegisterAsyncTask(new PageAsyncTask(GetDataFromServicesAsync));
}

As you can see, Page_Load event handler registers an asynchronous task using RegisterAsyncTask() method. The RegisterAsyncTask() method accepts an instance of PageAsyncTask. The PageAsyncTask instance in turn wraps the GetDataFromServicesAsync() method created earlier.

The final step is to set Async attribute of the @Page directive to true:

<%@ Page Async="true" Language="C#" CodeBehind="WebForm1.aspx.cs" ... %>

The Aync attribute of the @Page directive indicates that this web form will be executed in asynchronous fashion. Web forms that use RegisterAsyncTask() method must set the Async attribute to true, otherwise an exception is raised at runtime.

This completes the application and you can test it by running the web forms application. The following figure shows a sample run of the web form:

 
A sample run of the web form

Though the code doesn't show the synchronous execution of the Web API operations, for the sake of better understanding the above figure shows time taken for synchronous as well as asynchronous execution. Recollect that both the Get() methods sleep for 5 seconds and hence the synchronous execution takes approximately 10 seconds. However, the asynchronous execution takes approximately 5 seconds. As you can see the asynchronous operation improves the overall performance of the application.

Summary

Using async and await keywords you can create operations that run asynchronously. Such asynchronous tasks can be registered with the page framework using RegisterAsyncTask() method. Registered tasks run immediately after the PreRender event of the web form. Asynchronous operations can improve the overall performance and user responsiveness of a web application.



.NET 4.5 Beta FREE Hosting with ASPHostCentral.com

clock March 14, 2012 08:40 by author Administrator

ASPHostCentral.com, the leader in ASP.NET and Windows Hosting Provider, proudly announces that we will support ASP.NET 4.5 Hosting.

To support Microsoft ASP.NET 4.5 Beta Framework, we gladly inform you that we provide this beta account FREE of charge for a limited time (* terms and conditions apply).


The followings are the features you will get under this FREE ASP.NET 4.5 BETA Account:                

- .NET 4.5 Beta Framework
- 1 Website/Domain
- 100 MB disk space
- 100 MB bandwidth
- 50 MB SQL 2008 space
- 24/7 FTP access
- Windows Server 2008 Platform

 If you want to participate in this Beta program, there are several rules you need to understand:              

- As this is a beta version, not all the features are available. They may be some issues on this beta framework, which will be fixed upon the full release of ASP.NET 4.5 Framework
- ASPHostCentral.com does not guarantee the uptime of the sandbox solution. Additionally, we do not keep/store any backup of your files/accounts
- ASPHostCentral.com does not guarantee rapid response to any inquiries raised by a user
- This free account is only meant for testing. Users should not use it to store a production, personal, e-commerce or any blog-related site
- This free account is used to host any ASP.NET 4.5 beta website only. Any questions that are not related to ASP.NET 4.5 beta will not be responded. A user shall not host any non-ASP.NET 4.5 site on this free account either
- ASPHostCentral.com reserves full rights to terminate this beta program at any time. We will provide a notification on our Help Desk System prior to the termination of this program
- ASPHostCentral.com reserves full rights to terminate a user account, in which we suspect that there is an abuse to our system
- Once this beta program is terminated, your account will be completely wiped/remove from our system.
- For details, please check
http://www.asphostcentral.com/ASPNET-45-Beta-Hosting.aspx
- This offer expires on 31st May 2012

If you want to participate on this FREE ASP.NET 4.5 Beta Program, you must register via https://secure.asphostcentral.com/BetaOrder.aspx

 



ASP.NET 4.5 Hosting :: ASP.NET 4.5 Strongly Typed Data Controls & Model Binding

clock March 8, 2012 07:43 by author Administrator

One pain point that’s dogged WebForm developers for some time is the fact that there haven’t been any strongly typed data controls.  Some of the data controls I’m speaking of include the Repeater, FormView and GridView controls.  They all used templates, which could allow you to specify a view for different operations, such as when you’re editing data compared to adding new data.

When you use these templates today, they’re using late bound expressions to bind the data.  If you’re using the GridView control, or any of the other data controls, you’ll be familiar with the Bind or Eval syntax:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
      <Columns>
           <asp:TemplateField HeaderText="Name">
                    <ItemTemplate>
                        <asp:Label ID="lblName" runat="server" Text='<%# Bind("Name") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="City">
                     <ItemTemplate>
                        <asp:Label ID="lblCity" runat="server" Text='<%# Bind("Address.City") %>'></asp:Label>
                     </ItemTemplate>
                </asp:TemplateField>
      </Columns>
 </asp:GridView>


One of the problems with late-bound data controls is you’re using a string to represent a property name.  If you make a mistake typing the name, you won’t see the exception until runtime.  It’s much better to catch these errors at compile time.  Thankfully Microsoft has addressed this in ASP.NET 4.5 by implementing strongly typed data controls.

Installation

Before starting any development, you’ll need to install ASP.NET 4.5.  The simplest way to do this is via the Web Platform Installer.  All of the ASP.NET 4.5 articles I’m authoring are developed in Visual Studio 2011 Developer Preview. Here’s the link to get started.

Strongly Typed Data Controls

ASP.NET 4.5 introduces strongly typed data controls in the templates.  A new ModelType property has been added to the data controls, and this allows you to specify the type of object that is bound to the control.

Setting this property will add that type to the data controls Intellisense (an autocomplete function), which means no more typing mistakes!  This removes the need to run the website to see if you’ve made any typing mistakes during development.

In this example, I’ve connected to a Northwind web service.  Using ASP.NET 4.5, I can set the ModelType to Northwind.  If the requirement is for one-way data binding, you can use the Item expression.  Bind("Name") becomes Item.Name.  The same goes for the City property.  Replace Bind("Address.City") with Item.Address.City.

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"            ModelType="WebApplication2.NorthwindService.Supplier">
        <Columns>
            <asp:TemplateField HeaderText="Name">
                <ItemTemplate>
                    <asp:Label ID="lblName" runat="server" Text='<%# Item.Name %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="City">
                <ItemTemplate>
                    <asp:Label ID="lblCity" runat="server" Text='<%# Item.Address.City %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>


For two-way data binding, use Binditem.  So using the example above, data binding to a text box would be like this:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"            ModelType="WebApplication2.NorthwindService.Supplier">
        <Columns>
            <asp:TemplateField HeaderText="Name">
                <ItemTemplate>
                    <asp:TextBox ID="txtName" runat="server" Text='<%# Binditem.Name %>'></asp:TextBox>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="City">
                <ItemTemplate>
                    <asp:TextBox ID="txtCity" runat="server" Text='<%# Binditem.Address.City %>'></asp:TextBox>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>

    </asp:GridView>

Intellisense is available, so there’ll be no more mistyped properties you only find out about at runtime.

Model Binding

Model binding focuses on coded data access logic.  Previously if you wanted to display data in the GridView control, you either had to explicitly set the DataSource property and call its DataBind method from the code behind.  Like this example:

protected void Page_Load(object sender, EventArgs e)
{
     var products = GetProducts();
     GridView1.DataSource = products;
     GridView1.DataBind();
}

Alternatively you could use one of the many data source controls to bind the data to the GridView.  Now that model binding is part of ASP.NET, you can explicitly tell the GridView which method to call to retrieve its data by using the SelectMethod property.  Here’s the updated GridView.

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"            ModelType="WebApplication2.NorthwindService.Supplier"
            SelectMethod="GetProducts">
        <Columns>
            <asp:TemplateField HeaderText="Name">
                <ItemTemplate>
                    <asp:Label ID="lblName" runat="server" Text='<%# Item.Name %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="City">
                <ItemTemplate>
                    <asp:Label ID="lblCity" runat="server" Text='<%# Item.Address.City %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>


And in the code behind, here’s the GetProducts method:

public IQueryable<NorthwindService.Supplier> GetProducts()
{
    var service = new NorthwindService.DemoService(new Uri(@"http://services.odata.org/OData/OData.svc/"));
    var suppliers = (from p in service.Suppliers
                             select p);
    return suppliers;
}


This method doesn’t need to be in the code behind. It could live in another class or assembly.  The benefit of returning IQueryable  is that it enables deferred execution on the query, and allows a data-bound control to further modify the query before executing it.  This is useful when you need to implement sorting and paging methods.

I’m excited by the model binding and strongly bound data controls in ASP.NET 4.5.  It has certainly borrowed these ideas and concepts from MVC, so fingers crossed more of them are implemented in upcoming versions



ASP.NET 4.5 Hosting :: Model Binding Feature in ASP.NET 4.5

clock November 28, 2011 10:05 by author Administrator

The Good News - In ASP.NET 4.5, we can adopt an approach using which the Model can be directly bound with the DataBound controls and CRUD and pagination operations can be implemented very effectively. It incorporates concepts from the ObjectDataSource control and from model binding in ASP.NET MVC. We will see this shortly. ASP.NET 4.5 is based upon .NET 4.5 and it gets installed once you install Visual Studio 2011 preview. 

Note: If you want to install Visual Studio 2011 preview, you can also use the Windows 8 Developer preview.

In this article I will be explaining a new ASP.NET 4.5 exciting feature called ‘Model Binding with Web Forms’. Up to previous versions, webforms for data-binding used to make use of the ‘Eval’ method. During runtime, calls to Eval makes use of reflection against the currently bound data object and reads value of the member with the given name in Eval method. (Read Why Eval is Evil). Once this value is read the result is displayed in HTML. Although this is easiest way of data-binding, it has limitations like checking the binding name during compilation time etc.

Update: Also check out the second part of this article ASP.NET 4.5: Filtering using Model Binding in ASP.NET Web Forms

In ASP.NET 4.5 the Model Binding has improved. We will be going through the complete model binding feature using the following steps:

- Model binding with Web Forms.
- Value Providers.
- Filtering.
- Performing Update Operations.

For this article I am using Sql Server 2008 R2 and a ‘Company’ database, with following Tables:

Department - DeptNo (int) Primary Key, Dname (varchar(50)),Location (varchar(50)).
Employee - EmpNo (int) Primary Key, EmpName (varchar(50)),Salary (int), DeptNo(int) Forwign Key.

Let’s get started.

Step 1: Open Visual Studio 2011 Developer Preview and create a new Web Application, make sure that the Framework version you select is .NET 4.5. Call this application ‘ASPNET45_ModelBinding’.

Step 2: In this project, add new folders and name them as Model and Department. In the Department folder, add two Web Forms (with master page). Name them as ‘Departments.aspx’ and ‘DepartmentDetails.aspx’.

Step 3: In the Model folder, add a new ADO.NET entity data model and name it as ‘CompanyEDMX.edmx’. In the Wizard, select Company Database and select Department and Employee table. After the completion of wizard, the below result will be displayed:


Step 4: Open the Departments.aspx in the ‘Source’ view and add the Repeater control in it with the Department model bound to it as below.

The above code shows some modified databound features for DataBound controls in ASP.NET 4.5. The Department Model is assigned to the ‘ModelType’ property of the repeater. This property is available to all DataBound controls. This allows us to define the type of data that is bound to the control and also allows to bind properties of the Model inside the control. The above code defines ‘ItemTemplate’ inside the repeater control which refers to the ‘DepartmentDetails.aspx’ by passing DeptNo value using QueryString to it.


Step 5: Go to the Departments.aspx.cs code behind, and write the following code:

The above code sets the datasource property for the repeater control.


Step 6: View the Departments.aspx inside the browser and the following result will be displayed:  
In your OS, observe the lower right corner of the System Tray. Instead of the ASP.NET Development server, ASP.NET 4.5 uses IIS Express as shown below:  





Step 7
: In Step 4, we added the repeater control which has the ItemsTemplate and contains an <a href=””> to navigate to DepartmentDetails.aspx using a query string. This page is designed for displaying details of a particular Department. Open DepartmentDetails.aspx in the ‘Source’ view and add a DetailsView web UI databound control inside it. As explained Step 4, we need to assign the ModelType property of this control to ‘Department’ model.

All those who have used controls like DetailsView or FormView knows that these control are used for performing DML operations. Now to perform DML operations in earlier versions of ASP.NET i.e. from 2.0 to 4.0 we used to make use of ObjectDataProvider and this provider was usually configured using Get,Insert,Update and Delete methods form the source object. However the ASP.NET 4.5 DataBound controls e.g. GridView, FormView, DetailsView etc, exposes the following properties:

- SelectMethod: Used to make call to a method which returns IEnumarable.
- InsertMethod: Used to make call to a method which performs Insert operation.
- UpdateMethod: Used to make call to a method which performs Update operation.
- DeleteMethod: Used to make call to a method which performs Delete operation.

Configure the DepartmentDetails.aspx as shown below:


Step 8: Open the DepartmentDetails.aspx.cs and add the following code in it:    


Now carefully have a look at the above methods. None of these methods make use of any of the UI controls in the user interface. All these methods strictly work on Model objects and this feature drastically reduces additional coding. One more important fact is, if you observe the ‘GetDepartment()’ method, it has defined the ‘DeptNo’ input parameter with the QueryString Value provider. This automatically reads the DeptNo in the QueryString and displays the Department details inside the DetailsView.

Note: In previous versions of ASP.NET we could have done this using Request.QueryString[“DeptNo”]

Step 9: Now open Site.Master and add the following menu item:

<asp:MenuItem NavigateUrl="~/Department/Departments.aspx" Text="Departments"/>

Step 10: Make Default.aspx as a startup page and run the application. You will see the Default.aspx with Department and Employee menu. Once you click on ‘Department’ menu, Departments.aspx will be displayed. Now click on any Department and you will be transferred to ‘DepartmentDetails.aspx’ as below:

The QueryString has the DeptNo and based upon the value of the DeptNo, the DetailsView will display the  Department details. Here you can now test the Update and New (insert) functionality.

Check out the second part of this article ASP.NET 4.5: Filtering using Model Binding in ASP.NET Web Forms

Conclusion: The Model binding feature provides facility to the developers to develop Webforms which can be independent from the Model

 

 

 

 

 

 

 

 



ASP.NET 4.5 Hosting :: Bundling and Minification EXPLAINED!

clock October 11, 2011 06:17 by author Administrator

Optimizing application performance  is a key element for business. There are several ways by which we can optimize the applications performance. It can be done either by server side code optimization, caching or some client side optimization. In this post I am going to discuss about one handy and smart way to optimize web applications performance using Bundling and Minification  features which is introduced with ASP.NET 4.5 Developer Preview. ASP.NET 4.5 Developer Preview introduced bundling, which combines multiple JavaScript files for faster loading with less number of requests for download and minification, which reduces the size of JavaScript and CSS files by removing unneeded characters .  Combination of these bundling and minification helps web pages to load very faster. Let’s have a looks how it works.

The below images shows the typical web application structure of  that contains CSS and Javascript files along with other asp.net elements

Scripts folder contains all the JavaScript files where as Styles contains all the CSS file. CSS  and JS files takes milliseconds of time  to load into the browser though it’s really matter how much time it’s takes to load the CSS and JS files.


This is how you refer the JavaScript and CSS in applications markup


Run your application and  inspect the loaded Css and JavaScript files using IE Developer toolbar . You can see all the mentioned css and JavaScript in the html markup  loaded individually


To take a more granular look on the loading perspective, you can use the IE Developer toolbar. You will find there are individual request to download the css and javascript files and each of them taken individual time

You can take a quick look using YSlow statistics viewer for total number of request for javascript and css files

ASP.NET 4.5 Introduced Bundling and Minifying the files which reduce the number of requests by merging the files into a single one. Bundling combines multiple JavaScript files for faster loading and reduced the number of request to download the files and minification reduces the size of JavaScript and CSS files by removing unneeded characters.

To apply the binding and  Minifying first of all you need to refer the folder for css and javascript instead of individual files. Along with the folder name you have the append css for CSS folder and js for JavaScript folder.


That’s all. Run the application once again and inspect the save thing for CSS and JavaScript in IE Developer Toolbar. Interestingly you will find only one CSS File and one JavaScript has been loaded




You can also use IE Developer toolbar to checkout the result. Yes, there is only two request, one for CSS and another for JavaScript. You can also find the significant amount of changes in file size and number of request for JS and CSS file also reduced


.NET 4.5 introduced a new class called BundleTable provides programmatic access to the collection of registered Bundle objects in an ASP.NET application. Bundle object  contains the  list of JavaScript or CSS files . ASP.NET runtime dynamically combines into a single virtual file that a browser can retrieve by using a single request


Every elements of Bundle object is a key value pair . Key is a string that define either “JS” or “Css” and Values contains the the type of  System.Web.Optimization.DynamicFolderBundle



You can create your custom bundles for JavaScript  as well as CSS.  Below code snippets shows the same

Once you have your own bundle object, you can specify the same in your html markup as shown in below


Now, run the application and inspect your own created bundle in IE Developer toolbar


One of the biggest advantages of this custom bundle objects is, you can refer multiple directories as shown in below code snippet

As shown in above code snippet, we are adding one directory for bundling with filtering criteria  of  “.JS” file. Boolean values indicate while adding the directory, it will ignore the sub directories

 



.NET 4.5 Hosting :: .NET 4.5 Framework Developer Preview

clock September 19, 2011 11:03 by author Administrator

 

[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]

This topic contains information about key features and improvements in the .NET Framework 4.5 Developer Preview. This topic does not provide comprehensive information and is subject to change.

New features and improvements are described in the following sections:

- .NET for Metro style apps
- Core New Features and Improvements
- Web
- Networking
- Windows Presentation Foundation (WPF)
- Windows Communication Foundation (WCF)
- Windows Workflow Foundation (WF)

.NET for Metro style apps

Metro style apps are designed for specific form factors and leverage the power of the Windows operating system. A subset of the .NET Framework is available for building Metro style apps for Windows using C# or Visual Basic. This subset is called .NET APIs for Metro style apps.

Core New Features and Improvements

The following features and improvements were added to the common language runtime and to .NET Framework classes:

- Ability to limit how long the regular expression engine will attempt to resolve a regular expression before it times out.
- Ability to define the culture for an application domain.
- Console support for Unicode (UTF-16) encoding.
- Support for versioning of cultural string ordering and comparison data.
- Better performance when retrieving resources.
- Zip compression improvements to reduce the size of a compressed file.
- Ability to customize a reflection context to override default reflection behavior through the CustomReflectionContext class.

Managed Extensibility Framework (MEF)

The Managed Extensibility Framework (MEF) provides the following new features:
- Support for generic types.
- Convention-based programming model that enables you to create parts based on naming conventions rather than attributes.
- Multiple scopes.

Asynchronous File Operations

In the .NET Framework 4.5 Developer Preview, new asynchronous features were added to the C# and Visual Basic languages. These features add a task-based model for performing asynchronous operations. To use this new model, use the asynchronous methods in the I/O classes.

Web

ASP.NET 4.5 Developer Preview includes the following new features:

- Support for new HTML5 form types.
- Support for model binders in Web Forms. These let you bind data controls directly to data-access methods, and automatically convert user input to and from .NET Framework data types.
- Support for unobtrusive JavaScript in client-side validation scripts.
- Improved handling of client script through bundling and minification for improved page performance.
- Integrated encoding routines from the AntiXSS library (previously an external library) to protect from cross-site scripting attacks.
- Support for WebSockets protocol.
- Support for reading and writing HTTP requests and responses asynchronously.
- Support for asynchronous modules and handlers.
- Support for content distribution network (CDN) fallback in the ScriptManager control.

Networking

The .NET Framework 4.5 Developer Preview provides a new programming interface for HTTP applications. For more information, see the new System.Net.Http and System.Net.Http.Headers namespaces.

Also, the following networking improvements are included in the System.Net, System.Net.Mail, and related namespaces:

- Improved internationalization and IPv6 support.
- RFC-compliant URI support.
- Support for Internationalized Domain Name (IDN) parsing.
- Support for Email Address Internationalization (EAI).

Windows Presentation Foundation (WPF)

In the .NET Framework 4.5 Developer Preview, Windows Presentation Foundation (WPF) contains changes and improvements in the following areas:

- The new Ribbon control, which enables you to implement a ribbon user interface that hosts a Quick Access Toolbar, Application Menu, and tabs.
- The new INotifyDataErrorInfo interface, which supports synchronous and asynchronous data validation.
- New features for the VirtualizingPanel and Dispatcher classes.
- Improved performance when displaying large sets of grouped data, and by accessing collections on non-UI threads.
- Data binding to static properties, data binding to custom types that implement the ICustomTypeProvider interface, and retrieval of data binding information from a binding expression.
- Repositioning of data as the values change (live shaping).
- Better integration between WPF and Win32 user interface components.
- Ability to check whether the data context for an item container is disconnected.
- Ability to set the amount of time that should elapse between property changes and data source updates.
- Improved support for implementing weak event patterns. Also, events can now accept markup extensions.

Windows Communication Foundation (WCF)

In the .NET Framework 4.5 Developer Preview, the following features have been added to make it simpler to write and maintain Windows Communication Foundation (WCF) applications:

- Simplification of generated configuration files.
- Support for contract-first development.
- Ability to configure ASP.NET compatibility mode more easily.
- Changes in default transport property values to reduce the likelihood that you will have to set them.
- Updates to the XmlDictionaryReaderQuotas class to reduce the likelihood that you will have to manually configure quotas for XML dictionary readers.
- Validation of WCF configuration files by Visual Studio as part of the build process, so you can detect configuration errors before you run your application.
- New asynchronous streaming support.
- New HTTPS protocol mapping to make it easier to expose an endpoint over HTTPS with Internet Information Services (IIS).
- Ability to generate metadata in a single WSDL document by appending ?singleWSDL to the service URL.
- Websockets support to enable true bidirectional communication over ports 80 and 443 with performance characteristics similar to the TCP transport.
- Support for configuring services in code.
- XML Editor tooltips.
- ChannelFactory caching support.
- Binary encoder compression support.

Windows Workflow Foundation (WF)

Several new features have been added to Windows Workflow Foundation (WF) in the .NET Framework 4.5 Developer Preview. These new features include:

- Ability to create state machine workflows.
- Enhanced Workflow Designer features such as the following:
    - Enhanced workflow search capabilities in Visual Studio, including Quick Find and Find in Files.
    - Ability to automatically create a Sequence activity when a second child activity is added to a container activity, and to include both activities in the Sequence activity.
    - Panning support, which enables the visible portion of a workflow to be changed without using the scroll bars.
    - A new Document Outline view that shows the components of a workflow in a tree-style outline view and lets you select a component in the Document Outline view.
    - Ability to add annotations to activities.
    - Ability to define and consume activity delegates by using the workflow designer.
    - Auto-connect and auto-insert for activities and transitions in state machine and flowchart workflows.
- Storage of the view state information for a workflow in a single element in the XAML file, so you can easily locate and edit the view state information.
- A NoPersistScope container activity to prevent child activities from persisting.
- Support for C# expressions:
    - Workflow projects that use Visual Basic will use Visual Basic expressions, and C# workflow projects will use C# expressions.
    - C# workflow projects that were created in Visual Studio 2010 and that have Visual Basic expressions are compatible with C# workflow projects that use C# expressions.
- Versioning enhancements:
    - The new WorkflowIdentity class, which provides a mapping between a persisted workflow instance and its workflow definition.
    - Side-by-side execution of multiple workflow versions in the same host, including WorkflowServiceHost.
    - In Dynamic Update, the ability to modify the definition of a persisted workflow instance.
- Contract-first workflow service development, which provides support for automatically generating activities to match an existing service contract


This article is sourced from http://msdn.microsoft.com/en-us/library/ms171868(v=VS.110).aspx as it is correct as per 19th Sept 2011.

 



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