Write a program in C# Sharp to create and read the last line of a file

using System;
using System.IO;


class filexercise12
{
    static void Main()
    {
		string fileName = @"mytest.txt"; 
		string[] ArrLines ;
		int n,i;

	    Console.Write("\n\n Create and read the last line of a file  :\n");
		Console.Write("-----------------------------------------------\n"); 

            if (File.Exists(fileName))
            {
                File.Delete(fileName);
            }
       Console.Write(" Input number of lines to write in the file  :");
       n= Convert.ToInt32(Console.ReadLine()); 
       ArrLines=new string[n];      
       Console.Write(" Input {0} strings below :\n",n);
		for(i=0;i<n;i++)
		{
		Console.Write(" Input line {0} : ",i+1);
		ArrLines[i] = Console.ReadLine();	
		}	
        System.IO.File.WriteAllLines(fileName, ArrLines);
             Console.Write("\n The content of the last line of the file {0} is  :\n",fileName);
			if (File.Exists(fileName))
				{
				string[] lines = File.ReadAllLines(fileName);
				Console.WriteLine(" {0}",lines[n-1]);
				}        
            Console.WriteLine();       
    }
}