using System;
public class clsSubstring
{
 
    public void Main()
    {
 
 
 
        //****************************************************************************************
        // Example #1: Substring(startIndex[, length])
        // Returns the string that starts at the specified position and has the specified
        // length. If the length is not specified, all of the characters to the end are returned.
        //****************************************************************************************
 
        Console.WriteLine("Example #1: Substring(startIndex[, length]) ");
 
        string strSubstringExample = "This is a test string";
        int intIndexSubstring = 0;
 
        // First find position of word test
        intIndexSubstring = strSubstringExample.IndexOf("test");
 
        // Get everything starting at "test" to end of string
        Console.WriteLine(strSubstringExample.Substring(intIndexSubstring));
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //Prevent console from closing before you press enter
        Console.ReadLine();
 
    }
 
 
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
nameSubstring CSharp_Syntax
{
    class Program
    {
        static void Main(string[] args)
        {
 
 
            clsSubstring mySubstring = new clsSubstring();
            mySubstring.Main();
 
        }
    }
}