or
<telerik:RadTextBox runat="server" ID="myTextBox" Width="150px" Text='<%#Bind("Number")%>'><ClientEvents OnLoad="showPLC" OnKeyPress="showPLC" /></telerik:RadTextBox><script language="javascript" type="text/javascript"> function showPLC() { var eItem = $find('<%= RadListView1.Items[0] %>'); if (eItem.IsInEditMode) { var num = eItem.FindControl("myTextBox").val(); var bin = num.substring(0,6); if (bin == '577442') { eItem.FindControl("divEffect1").hide(); eItem.FindControl("divEffect2").slideDown(); } else { eItem.FindControl("divEffect1").slideDown(); eItem.FindControl("divEffect2").hide(); } } }</script>' The item exists, so select it inDDL.SelectedIndex = inDDL.FindItemIndexByValue(selectValue)