private void btnLogin_Click(object sender, EventArgs e) { if (txtUName.Text == string.Empty) { MessageBox.Show("you must enter username"); return; } if (txtUPass.Text == string.Empty) { MessageBox.Show("you must enter the password"); return; } DataTable dt = CLASS_LOGIN.splogin(txtUName.Text, txtUPass.Text); if (dt.Rows.Count > 0) { FRM_MAIN.check = true; FRM_MAIN.P_ID = int.Parse(dt.Rows[0]["per_ID"].ToString()); Program.USERFULLNAME = dt.Rows[0]["U_Full_Name"].ToString(); this.Close(); } else { MessageBox.Show("username or password is wrong"); } }