Interface and it's implementation, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    interface IShape   // interface
    {
        void Display();   // by default all methods are public, only declaration of method is allowed
        
        void Draw();
    }
    
    class Circle : IShape  // all methods declared in interface must be implemented in derived class
    { 
        public void Display()  // implemented Display() method
        {
            Console.WriteLine("Display implemented in Circle");
        }
        
        public void Draw()  // implemented Draw() method
        {
            Console.WriteLine("Drawing a circle");
        }
    }
    
    
    public class Program
    {
        public static void Main(string[] args)
        {
            Circle c1 = new Circle();
            c1.Display();
            c1.Draw();
        }
    }
}

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Compilation time: 0,16 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 11 Mb, average nr of threads: 2