protected void loginButton_Click(object sender, EventArgs e) { string msg = ""; DAO.Center aCenter = new DAO.Center(); aCenter.Code = codeTextBox.Text; aCenter.Password = passwordTextBox.Text; CenterManager aCenterManager = new CenterManager(); aCenter = aCenterManager.CheckCodePassword(aCenter); if (aCenter == null) { msg = "Error code & password...!!!!"; } else { Session["CenterId"] = aCenter.Id; Session["user"] = "******"; Response.Redirect("CenterMainUI.aspx"); } }