Calling the grand-parent implementation of an overridden method [duplicate]

Question

Possible Duplicate:
How to call base.base.method()?

I have some trouble with Inheritance in C#. I've sketched three classes: A, B and C. C inherits from B and B from A. Now the B class calls base.Method1 and works fine but I can't call A.method1 from the C class. If I call base.Method1 from C obviously that method will be method1 of B. Any advice?

P.S. in A class there are some fields marked private so you can access them only

class A
{    
    private instance;    
    public virtual void Method1 ()
    {       
        instance = this;
        do something;       
    }
}

class B : A
{
    public override void Method1()
    {
        base.Method1();
        do something;       
    }
}

class C : B
{   
    public override void Method1 ()
    {
        //need A Method1 then do something
    }
}

Answer 1

This is a feature of C#. If you wish to expose this method to class C, consider refactoring A like so:

class A
{    
  private instance;    
  public virtual void Method1 ()
  {
    AMethod1();       
  }

  protected void AMethod1()
  {
    instance = this;
    do something;       
  }
}

This will enable you to call this method from within C:

class C : B
{   
  public override void Method1 ()
  {
    AMethod1();
    // do something;
  }
}

Answer 2

It is not possible to do this in C#, thought its possible to do this via IL.

For your case, you may do something like this:

class A
{
    private int instance;
    public virtual void Method1()
    {
        Method1Impl();
    }

    protected void Method1Impl()
    {
    }
}

Now you can call A.Method1Impl from your C class.