private void button1_Click(object sender, EventArgs e) { if (CharsChecker(InFName.Text) && CharsChecker(InLName.Text) && InPassConf.Text.Length > 0 && NumsChecker(InPhone.Text) && InEmail.Text.Length > 0 && InPass.Text.Length > 0 && InCountry.SelectedIndex != -1 && InAge.SelectedIndex != -1) { if (ClientsData.Registered(InEmail.Text.ToLower())) { Client newUser = new Client(InEmail.Text, InPass.Text, InFName.Text, InLName.Text, InCountry.Text, InAge.Text, InPhone.Text); ClientsData.AddUser(newUser); MessageBox.Show("You Have Been Registered Successfully You Can Login Now!", "Congratulations"); this.Close(); } else { MessageBox.Show("You Have Already Registered An Account!", "Error"); } } else { MessageBox.Show("Please Correct Your Info And Try Again!", "Error"); } }