public override void ProcessRequest(System.Web.HttpContext )
{
//Check for authentication
    base.ProcessRequest(context);
}

5. First level nodes are loaded and when expanding a child node on a tree, base.ProcessRequest(context); runs, it throwing the error (Async request failed).

6. This error not occured with UltraWebTree. See the below for design source.

 UltraWebTree:

<ignav:ultrawebtree 
		id="TreeControl" 
		runat="server" 
		webtreetarget="ClassicTree" 
		loadondemand="manualsmartcallbacks" 
		compactrendering="False" 
		enableviewstate="true" 
		singlebranchexpand="false"
		>
		<clientsideevents 
			nodeclick="nodeClick" 
			nodeexpand="nodeExpand" 
			nodecollapse="nodeCollapse"
			dragstart="dragStart" 
			drop="drop" 
			dragover="dragOver" />
	</ignav:ultrawebtree>

WebDataTree:

<ig:WebDataTree ID="TreeControl" runat="server" InitialExpandDepth="0" EnableExpandOnClick="true"
                        InitialDataBindDepth="0" EnableAjax="true" 
                        SingleBranchExpandLevel="0"
                        SelectionType="Single" Visible="true" Height="100%" 
       ForeColor="Black" EnableConnectorLines="true" OnNodePopulate="TreeControl_NodePopulate" 
       OnNodeBound="TreeControl_NodeBound"        
       >

            <AutoPostBackFlags SelectionChanged="Async" />
            <ClientEvents  
    			NodeClick="nodeClick"
			    NodeExpanding="nodeExpand" 
                NodeCollapsing="nodeCollapse"       
                   Initialize="InitializeHandler"
                /> 
</ig:WebDataTree>

Thanks.

Karthik Thangavel.

Hi Milko,

Thanks for your reply ! The sample that you are sent just working fine.

The permission wrapper was in the parent page and child page(user control) derived that parent page. Now the permission handled in user control itself and its working fine.

Thanks,

Karthik Thangavel.