//This code is used to write data into .txt file...
FileStream fs = new FileStream("E:\\a.txt", FileMode.Create, FileAccess.Write);
StreamWriter write = new StreamWriter(fs);
string a_variable = "more advanced services to mobile or nomadic computing devices";
write.Write(a_variable);
write.Close();
fs.Close();
//This code is used to read data from.txt file...
FileStream fs1 = new FileStream("E:\\a.txt", FileMode.Open);
StreamReader read = new StreamReader(fs1);
string b = read.ReadToEnd();
Console.WriteLine(b);
read.Close();
fs1.Close();