using System;

public class Program

{

    public static void Main()

    {

        string text = "My dog is a cute dog";

            Console.WriteLine(text + "\t Length: " + text.Length);

​

            Console.WriteLine("\nPlease Enter Substring To Seek: ");

            string sub = Console.ReadLine();

​

            char[] arr = new char[sub.Length];

            sub.CopyTo(0, arr, 0, sub.Length);

​

            int pos = text.IndexOf(sub);

            report(pos, sub);

​

            pos = text.LastIndexOf(sub);

            report(pos, sub);

​

            pos = text.IndexOfAny(arr);

            report(pos, text.Substring(pos, 1));

​

            pos = text.LastIndexOfAny(arr);

            report(pos, text.Substring(pos, 1));

​

            Console.ReadKey();

    }

​

    static void report(int pos, string sub)

    {

        if (pos != -1)

        {

            Console.WriteLine("'" + sub + "' Found At " + pos);

        }

        else

        {

            Console.WriteLine("'" + sub + "' Not Found!");

    }

}