Lost listview datasource when button clicked

Question

I have radlistview. I add datasource to listview when page_load. But when I clicked I button in same page. I lost datasource of listview. Why? how can I fix it?

Answer 1

I found the solution. I added EnableViewState="true" property and problem fixed. Like this

<telerik:RadListView ID="lvDSTableSelection" runat="server" AllowMultiItemSelection="true" OnSelectedIndexChanged="lvDSTableSelection_SelectedIndexChanged" EnableViewState="true" >