NotImplementedException Class
.NET Framework Class Library
NotImplementedException Class

The exception that is thrown when a requested method or operation is not implemented.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
Visual Basic (Declaration)
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public Class NotImplementedException _
    Inherits SystemException
Visual Basic (Usage)
Dim instance As NotImplementedException
C#
[SerializableAttribute]
[ComVisibleAttribute(true)]
public class NotImplementedException : SystemException
Visual C++
[SerializableAttribute]
[ComVisibleAttribute(true)]
public ref class NotImplementedException : public SystemException
JScript
public class NotImplementedException extends SystemException

NotImplementedException uses the default Equals implementation, which supports reference equality. For a list of initial values for an instance of NotImplementedException, see the NotImplementedException constructors.

The following example throws this exception for a method that has not been developed.

Visual Basic
Sub Main()
    Try
        FutureFeature()
    Catch NotImp As NotImplementedException
        Console.WriteLine(NotImp.Message)
    End Try


End Sub

Sub FutureFeature()
    ' not developed yet.
    Throw New NotImplementedException()
End Sub
C#
static void Main(string[] args)
{
    try
    {
        FutureFeature();
    }
    catch (NotImplementedException notImp)
    {
        Console.WriteLine(notImp.Message);
    }
}

static void FutureFeature()
{
    // Not developed yet.
    throw new NotImplementedException();
}
System..::.Object
  System..::.Exception
    System..::.SystemException
      System..::.NotImplementedException
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

XNA Framework

Supported in: 3.0, 2.0, 1.0
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