protected void cmbCustomerCode_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e) { string RefID = cmbCustomerCode.SelectedValue.ToString(); //Customer Contact DataTable dtCustomerContact = objBSS.GetCustomerContact(RefID); if (dtCustomerContact.Rows.Count > 0) { cmbContact.DataSource = dtCustomerContact; cmbContact.DataTextField = "FullName"; cmbContact.DataValueField = "ContactID"; cmbContact.DataBind(); cmbContact.Items.Insert(0, new RadComboBoxItem("Please Select", "0")); //Opportunity Name DataTable dtOpportunity = objBSS.GetOpportunity(RefID); cmbOpportunity.DataSource = dtOpportunity; cmbOpportunity.DataTextField = "OppName"; cmbOpportunity.DataValueField = "OppID"; cmbOpportunity.DataBind(); cmbOpportunity.Items.Insert(0, new RadComboBoxItem("Please Select", "0")); } else { cmbContact.Items.Clear(); cmbContact.Items.Insert(0, new RadComboBoxItem("Please Select", "0")); cmbOpportunity.Items.Clear(); cmbOpportunity.Items.Insert(0, new RadComboBoxItem("Please Select", "0")); } }