Help me to resolve this senario in oops.

Question

Senario

 

Public  Classs  C1

{

public void Method1()

{

Console.WriteLine("Method1") ;

} 

} 

 

Public Classs C2

{

public void Method2()

{

Console.WriteLine("Method1") ;

}

}

 

 

Public Classs C3:C1,C2

{

Static Void Main()

{

C3 obj=new C3(); 

 //here i want call Method1 and Method to 

obj. Method1();

obj. Method2(); 

 

} 

 

}

 

 

How can i achive the above thing with out using interfaces.