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Win32Exception Class

Throws an exception for a Win32 error code.

Namespace:  System.ComponentModel
Assembly:  System (in System.dll)

<SerializableAttribute> _
<HostProtectionAttribute(SecurityAction.LinkDemand, SharedState := True)> _
Public Class Win32Exception _
	Inherits ExternalException _
	Implements ISerializable
Dim instance As Win32Exception


The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: SharedState. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

Win32 error codes are translated from their numeric representations into a system message when they are displayed. Use NativeErrorCode to access the numeric representation of the error code associated with this exception. For more information about the error codes, see "Win32 Error Codes" in the Platform SDK documentation at

The following code example shows how to catch a Win32 exception and interpret its content. The example attempts to start a nonexistent executable, which results in a Win32 exception. Upon catching the exception, the example fetches the respective error message, code, and origin of the exception.

    Dim myProc As New System.Diagnostics.Process()
    myProc.StartInfo.FileName = "c:\nonexist.exe"  'Attempting to start a non-existing executable
    myProc.Start()    'Start the application and assign it to the process component.    

Catch w As System.ComponentModel.Win32Exception
    Dim e As New Exception()
    e = w.GetBaseException()
End Try

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, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0