Cast an object to a base type C# with Example

Given the following definitions : 
public interface IMyInterface1 
{ 
string GetName(); 
} 
public interface IMyInterface2 
{ 
string GetName(); 
} 
public class MyClass : IMyInterface1, IMyInterface2 
{ 
string IMyInterface1.GetName() 
{ 
return "IMyInterface1"; 
} 
string IMyInterface2.GetName() 
{ 
return "IMyInterface2"; 
} 
} 
Casting an object to a base type example : 
MyClass obj = new MyClass(); 
IMyInterface1 myClass1 = (IMyInterface1)obj; 
IMyInterface2 myClass2 = (IMyInterface2)obj; 
Console.WriteLine("I am : {0}", myClass1.GetName()); 
Console.WriteLine("I am : {0}", myClass2.GetName()); 
// Outputs : 
// I am : IMyInterface1 
// I am : IMyInterface2