// This method fills a TreeView Web control from an XML file.
public void FillTreeView(TreeView treeVw, string fileName)
{
    // Get a reference to the current HttpContext
    HttpContext currentContext = HttpContext.Current;
    int i, j, k;
    TreeNode CurNode, NewNode;

    // Create and load an XML document
    XmlDocument XDoc = new XmlDocument();
    XDoc.Load(currentContext.Server.MapPath(fileName));

    // Get a map of the XML Document
    XmlDocumentSchema xSchema = new XmlDocumentSchema(XDoc, "");

    // Get a list of the root child views
    IDataSourceViewSchema[] RootViews = xSchema.GetViews();

    // Add each child to the TreeView
    for (i = 0; i < RootViews.Length; i++)
    {
        NewNode = new TreeNode(RootViews[i].Name);
        treeVw.Nodes.Add(NewNode);
        CurNode = treeVw.Nodes[i];

        // Get a list of children of this child
        IDataSourceViewSchema[] ChildViews = RootViews[i].GetChildren();
        // Add each child to the child node of the TreeView
        for (j = 0; j < ChildViews.Length; j++)
        {
            NewNode = new TreeNode(ChildViews[j].Name);
            CurNode.ChildNodes.Add(NewNode);
            CurNode = CurNode.ChildNodes[j];

            // Get a list of children of this child
            IDataSourceViewSchema[] ChildVws = ChildViews[j].GetChildren();
            // Add each child to the child node
            for (k = 0; k < ChildVws.Length; k++)
            {
                NewNode = new TreeNode(ChildVws[k].Name);
                CurNode.ChildNodes.Add(NewNode);
            }
            // Select the parent of the current child
            CurNode = CurNode.Parent;
        }
        // Select the parent of the current child
        CurNode = CurNode.Parent;
    }
}