C# String CopyTo()

public void CopyTo(int index, char[] ch, int start, int end)

using System;  
    public class StringExample  
    {  
        public static void Main(string[] args)  
        {  
             string s1 = "Hello C#, How Are You?";  
             char[] ch = new char[15];
             s1.CopyTo(10,ch,0,12);
             Console.WriteLine(ch);
        }  
    }  

How Are You?