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I am passing a number of parameters to the page. In the code the parameters is used to first locate the parent node and the the subsequent child node. In the form load event it works fine and are able to locate both the parent node and the child node.

if (!IsPostBack)

 /*OnSelectedNodeChanged="trvFolders_SelectedNodeChanged" OnTreeNodeExpanded="trvFolders_SelectedNodeExpanded"*/
 if (!string.IsNullOrEmpty(Request.QueryString["Location"]) && !string.IsNullOrEmpty(Request.QueryString["Folder"]))
 
 string MappedPath = "yyyyyyy";
 string UrlPath = "xxxxxxxxxxxxx";
 PAL004.DocumentLibraryFolders TopLocation;
 string Folder = Request.QueryString["Folder"];
 string Location = Request.QueryString["Location"];
 Enum.TryParse(Location,out TopLocation);

 LoadFolders(trvFolders);

 if (TopLocation != PAL004.DocumentLibraryFolders.None)
 
 PAL004.DocumentLibraryFolders DocumentLocation;
 LibraryDocument LocatedDocument = Documents.Where(doc => doc.ContextID.ToString() == Location).ToList().First();

 Enum.TryParse(LocatedDocument.ContextID.ToString(), out DocumentLocation);

 if (DocumentLocation == TopLocation)
 
 TreeNode tNode = trvFolders.FindNode(LocatedDocument.ID.ToString());
 PopulateSubDirectoriesL1(tNode);
 //tNode.Select();
 //tNode.ChildNodes[0].Expand();
 //tNode.Expand();
 //TreeNode sNode = trvFolders.SelectedNode;
 //sNode.Expand();
 string FindNodePathValue = LocatedDocument.ID + "/" + LocatedDocument.Link.Replace(MappedPath, UrlPath) + "\" + Folder;
 TreeNode cNode = trvFolders.FindNode(FindNodePathValue);
 trvFolders.DataBind();
 cNode.Select();
 cNode.Expand();
 trvFolders_SelectedNodeChanged(trvFolders, EventArgs.Empty);
 
 //Node = trvFolders.FindNode()
 

 
 else
 
 LoadFolders(trvFolders);
 
 trvFolders.CollapseAll();

 //TreeNode NodeFind = trvFolders.FindNode("21");
 //NodeFind.ExpandAll();

 BasePage bp = new BasePage();
 btnAdmin.Visible = bp.CheckAccess(pathparameter, AccessControl.AccessType.Any);

else

 trvFolders_SelectedNodeChanged(trvFolders, new EventArgs());

}

Why does not not expand the treeview on page?

Asp TreeView OnTreeNodeExpanded event prevents treeview from expanding states it might be caused by value and valuepath value not available. It is not the case. All nodes have values and valuepath. I can find the childnode and it expand but it is not displayed on the page.

TreeView - Node not expanding is realted to crownwood libraries

TreeView expanding wrong node The node values and values path are unique and is successfully located.