Generate TreeView Using C# Code

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                DocEng.TreeProvider cmsTree = new DocEng.TreeProvider(MembershipContext.AuthenticatedUser);
                var node = cmsTree.SelectSingleNode(SiteContext.CurrentSiteName, "/", "en-US");
                DocEng.TreeNodeCollection myChildren = node.AllChildren;
                IEnumerable<DocEng.TreeNode> TreeNodes = myChildren.AsEnumerable<DocEng.TreeNode>();
                foreach (var tree in TreeNodes.Where(x => x.NodeLevel == 0))
                {
                    System.Web.UI.WebControls.TreeNode ParenTreeNode = new System.Web.UI.WebControls.TreeNode();
                    ParenTreeNode.Text = tree.NodeID.ToString() + ". " + SiteContext.CurrentSiteName;
                    ParenTreeNode.Value = tree.NodeID.ToString();
                    AddNodes(ParenTreeNode);
                    tvContentTree.Nodes.Add(ParenTreeNode);
                }
            }
        }


  /// 

        /// Adding child for the parent 
        /// 

/// private void AddNodes(System.Web.UI.WebControls.TreeNode TreeNode) { DocEng.TreeProvider cmsTree = new DocEng.TreeProvider(MembershipContext.AuthenticatedUser); var node = cmsTree.SelectSingleNode(SiteContext.CurrentSiteName, "/", "en-US"); DocEng.TreeNodeCollection myChildren = node.AllChildren; IEnumerable<DocEng.TreeNode> childTreeNodes = myChildren.AsEnumerable<DocEng.TreeNode>(); foreach (var childTree in childTreeNodes.Where(x => x.NodeParentID == Convert.ToInt32(TreeNode.Value))) { System.Web.UI.WebControls.TreeNode ChildNode = new System.Web.UI.WebControls.TreeNode(); ChildNode.Text = childTree.NodeID.ToString() + ". " + childTree.DocumentName.ToString(); ChildNode.Value = childTree.NodeID.ToString(); TreeNode.ChildNodes.Add(ChildNode); AddNodes(ChildNode); if (childTree.NodeLevel == 1) ChildNode.Collapse(); } }