private void btn_reg_Click(object sender, EventArgs e) { Contacts.Service1 ser = new Contacts.Service1(); ser.IsUserRegister(txtUsr.Text, txtPwd.Text, txtEm.Text, txtCell.Text); if (txtUsr.Text.Length == 0) { txtUsr.Focus(); return; } txtUsr.Text = ""; txtPwd.Text = ""; txtEm.Text = ""; txtCell.Text = ""; MessageBox.Show("User has been register"); txtUsr.Focus(); }