or
function OpTComboIndexChanged(sender, args) {
var tableView = $find("<%# ((GridItem)Container).OwnerTableView.ClientID %>");
var ss = args.get_item().get_value();
if (ss != "Other") {
tableView.filter("Operation_Type", args.get_item().get_value(), "EqualTo");

<FilterTemplate> <telerik:RadComboBox ID="dpdDataCllctnTypFilter" DataSourceID="dsDataCllctnTypFilter" Width="100%" DataTextField="Nm" DataValueField="Nm" Height="200px" AppendDataBoundItems="true" SelectedValue='<%# TryCast(Container, GridItem).OwnerTableView.GetColumn("A").CurrentFilterValue%>' runat="server" OnClientSelectedIndexChanged="dpdDataCllctnTypFilterChanged" OnSelectedIndexChanged="cboDcTypFilter_SelectedIndexChanged" > <Items> <telerik:RadComboBoxItem /> </Items> </telerik:RadComboBox> <telerik:RadScriptBlock ID="RadScriptBlock2" runat="server"> <script type="text/javascript"> function dpdDataCllctnTypFilterChanged(sender, args) { var tableView = $find("<%# TryCast(Container, GridItem).OwnerTableView.ClientID %>"); var s = args.get_item().get_value(); tableView.clearFilter("B"); // Added to clear the filter on column B if (s == '') tableView.clearFilter("A") else tableView.filter("A", s, "EqualTo"); } </script> </telerik:RadScriptBlock></FilterTemplate>