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NoStartupFormException Class

This exception is thrown by the Visual Basic Application Model when the MainForm property has not been set.

Namespace:  Microsoft.VisualBasic.ApplicationServices
Assembly:  Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

public ref class NoStartupFormException : public Exception

The Visual Basic Application Model requires that the application set the MainForm property before running the OnRun method. If the property is not set, the Visual Basic Application Model raises this exception. For more information, see Extending the Visual Basic Application Model.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0