using System;
public class clsIndexOf
{
 
    public void Main()
    {
 
 
 
        //****************************************************************************************
        // Example #1: IndexOf(string[, startIndex][,count])
        // Returns an integer that represents the position of the first occurrence of the
        // specified number of characters. If you specify startIndex, that specifies
        // where to start looking. If you specify count, that specifies how many characters to 
        // to search past start. If the string is not found, this method returns -1
        //****************************************************************************************
 
        Console.WriteLine("Example #1: IndexOf(string[, startIndex][,count]) ");
 
        string strIndexOfExample = "This is a test string";
 
        Console.WriteLine(strIndexOfExample.IndexOf("is")); //Returns 2
 
        Console.WriteLine(strIndexOfExample.IndexOf("xyz")); //Returns -1 (not found)
 
        //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;
 
namespace CSharp_Syntax
{
    class Program
    {
        static void Main(string[] args)
        {
 
 
            clsIndexOf myIndexOf = new clsIndexOf();
            myIndexOf.Main();
 
        }
    }
}