IndexOf() and LastIndexOf() in C#

The IndexOf() method returns the index number of the first matched character whereas the LastIndexOf() method returns the index number of the last matched character.

using System;   
    public class StringExample    
    {    
        public static void Main(string[] args)    
        {    
           string s1 = "Hello C#";  
           int first = s1.IndexOf('l');  
           int last = s1.LastIndexOf('l');  
           Console.WriteLine(first);  
           Console.WriteLine(last);  
      }    
    }