Please post the @Control directive in your View.ascx.

Also, on the Application tab of the projects property pages in Visual Studio, is there any text entered in the Root Namespace text box?

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
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I've never used Visual Web Developer 2010 Express so don't know if VWD lets you specify a root namespace.

As I suspected, the problem is in the @ Control directive in View.ascx:

1. In your CodeFile, View.ascx.cs, the fully qualified partial class name is "HelloWorld3.View"
2. However, in the .ascx control, the Inherits attribute is "DesktopModules_HelloWorld3_View".
3. Assuming that there is no root namespace box specifying a root namespace of "DesktopModules", the Inherits attribute in the @Control directive should be changed to Inherits="HelloWorld3.View" Note the use of a dot instead of an underscore to separate the namespace from the class name.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner