asp.net - RadComboBox load all item s on load and allow filtering on typing of text -

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i use radcombobox , use code same mentioned @ site http://demos.telerik.com/aspnet-ajax/combobox/examples/populatingwithdata/autocompletesql/defaultcs.aspx

i use code "server side" on page mentioned in above link.

however able populate values first time page loaded when type in text not refine .am missing out on ?

regards, francis p.

have done properties this. 

 enableloadondemand="true" showmoreresultsbox="true" enablevirtualscrolling="true"

and filtering need implement item requested event. 

 onitemsrequested="radcombobox1_itemsrequested"  , server method this.   protected void radcombobox1_itemsrequested(object sender, radcomboboxitemsrequestedeventargs e)         { }

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