how to create text file in window form in C#

 pathRainfallFile = txtSavingLocation.Text;
                string fullRailfallPathFile = Path.Combine(pathRainfallFile, "Rainfall.txt");
                FileStream fsRainfall = new FileStream(fullRailfallPathFile, FileMode.Create, FileAccess.Write);
                StreamWriter swRainfall = new StreamWriter(fsRainfall, Encoding.UTF8);
                //  190770        ABC                    +1900 +07700 +0392
                swRainfall.Write("190770");
                swRainfall.Write("\t");
                swRainfall.Write("ABC");
                swRainfall.Write("\t");
                swRainfall.WriteLine("+1900 +07700 +0392");

                swRainfall.WriteLine(" -------- ----   1 ----   2 ----");
                // CommonEntryPart(swRIBASIM, dtRIBASIM, lstStatioName, 2);
                swRainfall.Flush();
                swRainfall.Close();
                fsRainfall.Dispose();