abstract class method

Question

in abstract class if we take abstract method&child class have one method with same method name how can we clall base class method?

public abstract class project

{

       public void m1()

       {

       console.writeline("this is base class method"); 

       } 

} 

public class miniproject:project

{

   public void m1()

   {

   console.writeline("this is child class method"); 

   } 

} 

how can we call base class?