protected void btnAdd_Click(object sender, EventArgs e) { string email = comboboxTo.Text; int receiver = controller.GetReceiver(id, value); if (receiver == 1) { customercontroller.CheckCustomerEmail(id, email); customermodel = customercontroller.GetCustomerById(id); comboboxTo.DataSource = customermodel.Contacts; comboboxTo.DataBind(); } else if (receiver == 2) { providercontroller.CheckEmail(id, email); providermodel = providercontroller.GetCoreDataById(id); comboboxTo.DataSource = providermodel.Contacts; comboboxTo.DataBind(); } }