FIX: Code in the InitializeComponent Function Is Deleted When You Change the EnableViewState Property Value of a Page

By default, Microsoft Visual Studio .NET creates an InitializeComponent function when you use Visual C# to create a new ASP.NET Web project. This function is used to associate Event objects with controls. To view the code, expand the generated code in Web Form Designer. You will notice a declaration similar to the following:In some Visual Studio configurations, if you change the enableViewState property of a page, the code in the InitializeComponent function is deleted.

A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next .NET Framework service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Steps to Reproduce the Behavior

To reproduce the problem, follow these steps:

1. Before you create a new project, do the following:
   1. In Visual Studio .NET, click Options on the Tools menu.
   2. Expand HTML Designer, and then click General.
   3. Under Start HTML pages in, Start Active Server Pages in, and Start Web Form Pages in, click to select HTML View, and then click OK.
2. Use Visual C# to create a new ASP.NET Web Application project. When the form opens in HTML view, close the form.
3. In Solution Explorer, click Show All Files.
4. Double-click the .aspx file. The file opens in HTML view.
5. Switch to Design view, and then add a Web Form Button to the form.
6. Close the form. If you are prompted to save WebForm1.aspx, click Yes.
7. In Solution Explorer, double-click the .aspx file to open it again in HTML view.
8. In Solution Explorer, open the code behind page. To do this, expand Webform1.aspx, and then double-click Webform1aspx.cs.
9. Expand the generated code in Web Form Designer. The InitializeComponent function appears as one line of code:

   this.Load += new System.EventHandler(this.Page_Load);

   Note If you have added an event handler for the button, another line of code appears that associates the button with that event.
10. In Solution Explorer, double-click Webform1.aspx. The HTML view appears.
11. In Properties for this page, change the enableViewState value to false.
12. In Solution Explorer, double-click Webform1.aspx.cs. Notice that the code for the InitializeComponent function has been deleted.