Should IDisposable.Dispose() implementations be idempotent?

Question

The Microsoft.NET framework provides the IDisposable interface which requires an implementation of void Dispose() method. Its purpose is to enable

Answer 1

Yes, also make sure the other methods of the class respond correctly when they are called when the object has already been disposed.

public void SomeMethod()
{
     if(_disposed)
     {
         throw new ObjectDisposedException();
     }
     else
     {
         // ...
     }

}