ASP.NET My Controls disappear.

When you go into HTML View, and return to Designer View, your controls may disappear. Here is a possible fix.

http://support.microsoft.com/default.aspx?scid=KB;en-us;324199&

FIX: Data Loss When You Switch View in WebForm Designer
The information in this article applies to:
Microsoft Visual Studio .NET (2002)
Microsoft Visual Basic .NET (2002)
Microsoft Visual C# .NET (2002)

This article was previously published under Q324199
SYMPTOMS
When you change the view of a WebForm from HTML view to Design view, some or all of the controls on the WebForm disappear.
RESOLUTION
NOTE: The package does not prompt you to restart your computer, however, you must restart your computer after you apply this update.

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 Visual Studio .Net service pack that contains this fix.