Dynamic Treeview in asp.net using Entity Framework

<asp:TreeViewID="TreeView2"runat="server">

<HoverNodeStyleFont-Underline="True"ForeColor="#5555DD"/>

<NodeStyleFont-Names="Verdana"Font-Size="8pt"ForeColor="Black"HorizontalPadding="5px"NodeSpacing="0px"VerticalPadding="0px"/>

<ParentNodeStyleFont-Bold="False"/>

<SelectedNodeStyleFont-Underline="True"ForeColor="#5555DD"HorizontalPadding="0px"VerticalPadding="0px"/>

</asp:TreeView>

Database1Entities db = new Database1Entities();

Tbl_option qt = new Tbl_option();

Tbl_Question q = newTbl_Question();

Protectedvoid Page_Load(object sender, EventArgs e)

        {

          if(!this.IsPostBack)

            {

              BindTreeViewControl();

            }

        }

//for parent node

  #region asp

 Privatevoid BindTreeViewControl()

        {

         Var qtbl = (from a indb.Tbl_Questionselect a).ToList();

         for (inti = 0; i<qtbl.Count; i++)

            {

      TreeNode root = newTreeNode(qtbl[i].Question.ToString(), qtbl[i].QansId.ToString());

     //   root.SelectAction = TreeNodeSelectAction.Expand;

     TreeView2.Nodes.Add(root);

     CreateNode(root);

            }

        }

//For creating childnode

Publicvoid CreateNode(TreeNode node)

        {

       Int QId = Convert.ToInt32(node.Value);

       Var qtbl = (from a indb.Tbl_option where a.QansId == Qid select a).ToList();

       for (int i = 0; i<qtbl.Count; i++)

            {

     TreeNode Childnode = new TreeNode(qtbl[i].ans.ToString(), qtbl[i].ansId.ToString());

     Childnode.SelectAction = TreeNodeSelectAction.Expand;

     Childnode.ShowCheckBox = true;

     node.ChildNodes.Add(Childnode);

//    CreateNode(Childnode, Dt);

            }

        }

 #endregion