cs0809.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Compiler Warning (level 1) CS0809	Compiler Warning (level 1) CS0809	07/20/2015	CS0809	CS0809	2c2f0248-ab3a-4cdc-a1b0-2f0e05eac4c9

Compiler Warning (level 1) CS0809

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.

Example

// CS0809.cs
public class Base
{
    public virtual void Test1()
    {
    }
}
public class C : Base
{
    [System.Obsolete()]
    public override void Test1() // CS0809
    {
    }
}