protected void saveButton_Click(object sender, EventArgs e) { Center aCenter = new Center(); aCenter.Name = nameTextBox.Text; aCenter.DistrictId = Convert.ToInt32(districtDropDownList.SelectedValue); aCenter.ThanaId = Convert.ToInt32(thanaDropDownList.SelectedValue); Center center = aCenterManager.Find(aCenter); if (center == null) { aCenterManager.Save(aCenter); string centerCode = aCenterManager.GenerateRandom(6); string centerPassword = aCenterManager.GenerateRandom(8); Center centerFound = aCenterManager.Find(aCenter); aCenterManager.SaveCenterCodeAndPassword(centerFound.Id, centerCode, centerPassword); Response.Redirect("CenterInformation.aspx?name=" + centerFound.Name + "&code=" + centerCode + "&password="******"This name already exist."; } }