using System;

public class Program

{

    public static void Main()

    {

         StreamWriter myFile = File.AppendText("test1.txt");

            string line;

            do

            {

                Console.Write("Enter a text : ");

                line = Console.ReadLine();

                if (line != "")

                {

                    myFile.WriteLine(line);

                }

            } while (line != "");

            myFile.Close();

    }

}