// Step1: Add namespace & References library 
using System;

// Step2: Decalre a namespace 
namespace FrameworkNamespace
{
    // Step3: Declare the Interface. 
    public interface Iframework
    {
        // Step4: Declare functions needs to be in framework 
        // Usage: declare method <returntype> <methodname>(); 
        void method1 ();
        int method2 ();
        void method3 ();
    }
}