how to create login with using binary files system

Question

i have used this code but not successes. can u give me solution or can u give me different way of coding it big help to improve my knowledge.

public void button1_Click(object sender, EventArgs e) {
  string s;
  string[] ss = s.Split(':');
  using (StreamReader reader = new StreamReader("UserFile.txt")) {
    s = reader.ReadLine();
  }

  if (txtUser.Text == ss[0]) {
    if (txtPass.Text == ss[1]) {
      this.Hide();
      Properties.Settings.Default.ss = txtUser.Text;
      Properties.Settings.Default.Save();
      frmMainMenu mf = new frmMainMenu();
      mf.Show();
    }
    else {
      MessageBox.Show("Sorry Wrong Password");
    }
  }
  else {
    MessageBox.Show("Sorry Wrong Username");
  }        
}

Answer 1

Put all your checking logic inside the stream reader

public void button1_Click(object sender, EventArgs e)
    {

        using (StreamReader reader = new StreamReader("UserFile.txt"))
        {
           string s;
           s = reader.ReadLine();
           string[] ss = s.Split(':');
           if (txtUser.Text == ss[0])
           {
             if (txtPass.Text == ss[1])
             {
                this.Hide();
                Properties.Settings.Default.ss = txtUser.Text;
                Properties.Settings.Default.Save();
                frmMainMenu mf = new frmMainMenu();
                mf.Show();
             }
             else
             {
                MessageBox.Show("Sorry Wrong Password");
             }
           }  
           else
           {
             MessageBox.Show("Sorry Wrong Username");
           }
        }

   }