How do I make a RadGrid with a RadTreeview beside it and they both relate the same Data? And If the RadTreeview is collapsed, the same data in the radgrid will not be shown. Thanks
You can use self-referencing RadGrid to display the same data as the TreeView. Then you can handle the client-side events of the TreeView for OnClientNodeExpanded and OnClientNodeCollapsed to expand/collapse RadGrid hierarchy respectively. For your convenience I have prepared a sample project illustrating the suggested scenario.