RadMultiselect filtering call webservice function twice

[chandi]

Hi,

I am binding data to RadMultiSelect control through web service method.

when I am trying to filter data (typing on RadMultiselect control) it calls web service method twice.

Issue is, either it holds the filter value in first time hit, second time hit filter value get cleared. 

How can I prevent web service multiple times hit.

I have inserted the code for your reference.

<div>
            <telerik:RadScriptManager runat="server" ID="RadScriptManager1">
                <Scripts>
                    <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js" />
                    <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQuery.js" />
                    <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js" />
                </Scripts>
            </telerik:RadScriptManager>
            <telerik:RadAjaxPanel ID="ap" runat="server">
                <telerik:RadMultiSelect runat="server" Filter="Contains" EnforceMinLength="false" AutoClose="false" DataTextField="description" DataValueField="department" 
                Width="400px" ID="RadMultiSelect1" Placeholder="Shipping names..." DropDownHeight="130" ClientDataSourceID="RadClientDataSource1" AutoPostBack="false">
                <VirtualSettings ItemHeight="26" ValueMapper="valueMapper"  />
                <ItemTemplate>
                    <span class='order-id'>#= department #</span> #= description #
                </ItemTemplate>            
            </telerik:RadMultiSelect>
                <telerik:RadClientDataSource ID="RadClientDataSource1" runat="server"
                                EnableServerFiltering="true"
                                AllowPaging="true"
                                EnableServerPaging="true" PageSize="20">
                        <ClientEvents OnCustomParameter="OnCustomParameter" />
                        <DataSource>                                    
                            <WebServiceDataSourceSettings ServiceType="Default">                                        
                                <Select Url="WebService1.asmx/GetOrders" DataType="JSON" RequestType="Post" ContentType="application/json;charset=utf-8" />
                                    </WebServiceDataSourceSettings>
                                </DataSource>
                                <Schema DataName="d.Data" TotalName="d.Count" ResponseType="JSON">
                                    <Model>
                                        <telerik:ClientDataSourceModelField DataType="String" FieldName="department" />
                                        <telerik:ClientDataSourceModelField DataType="String" FieldName="description" />                                            
                                    </Model>
                                </Schema>
                            </telerik:RadClientDataSource>
                </telerik:RadAjaxPanel>
        </div>

 

Thanks & Regards,

Chandi