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Compiler Warning (level 1) CS0809

Visual Studio 2008

Obsolete member 'memberA' overrides non-obsolete member 'memberB'.

Typically, a member that is marked as obsolete should not override a member that is not marked as obsolete. This warning is generated in Visual Studio 2008 but not in Visual Studio 2005.

To correct this error

  • Remove the Obsolete attribute from the overriding member, or add it to the base class member.

// CS0809.cs
public class Base
    public virtual void Test1()
public class C : Base
    public override void Test1() // CS0809

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