using System;

public class Program

{

    public static void Main()

    {

        IFile file1 = new FileInfo();

        file1.ReadFile(); 

        file1.WriteFile("content"); 

        file1.DisplayName();

​

        FileInfo file2 = new FileInfo();

        //file2.DisplayName(); //compile-time error 

    }

}

​

interface IFile

{

    void ReadFile();

    void WriteFile(string text);

​

    void DisplayName()

    {

        Console.WriteLine("IFile");

    }

}

​

class FileInfo : IFile

{

    public void ReadFile()

    {

        Console.WriteLine("Reading File");

    }

​

    public void WriteFile(string text)

    {

        Console.WriteLine("Writing to file");

    }

}