Sample Download :
CS Version: http://code.msdn.microsoft.com/CSASPNETMaintainTreeViewSta-e65bee2f
VB Version: http://code.msdn.microsoft.com/VBASPNETMaintainTreeViewSta-0e427dfd
The code-sample illustrates how to maintain TreeView's state across postbacks.The web application uses session to store the TreeView node's status and restores them in the next postback event.
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