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<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web.Configuration" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
    void Page_Load()
    {
        if (!Page.IsPostBack)
            PopulateTreeView();
    }
    private void PopulateTreeView()
    {
        DataTable treeViewData = GetTreeViewData();
        AddTopTreeViewNodes(treeViewData);
    }
    private DataTable GetTreeViewData()
    {
        string selectCommand = "SELECT MessageId,ParentId,Subject FROM Discuss";
        string conString = WebConfigurationManager.ConnectionStrings["Discuss"]. ConnectionString;
        SqlDataAdapter dad = new SqlDataAdapter(selectCommand, conString);
        DataTable dtblDiscuss = new DataTable();
        dad.Fill(dtblDiscuss);
        return dtblDiscuss;
    }
    private void AddTopTreeViewNodes(DataTable treeViewData)
    {
        DataView view = new DataView(treeViewData);
        view.RowFilter = "ParentID IS NULL";
        foreach (DataRowView row in view)        {
            TreeNode newNode = new TreeNode(row["Subject"].ToString(), row["MessageId"].ToString());
            TreeView1.Nodes.Add(newNode);
            AddChildTreeViewNodes(treeViewData, newNode);
        }
    }
    private void AddChildTreeViewNodes(DataTable treeViewData, TreeNode parentTreeViewNode)
    {
        DataView view = new DataView(treeViewData);
        view.RowFilter = "ParentID=" + parentTreeViewNode.Value;
        foreach (DataRowView row in view)
        {
            TreeNode newNode = new TreeNode(row["Subject"].ToString(), row["MessageId"].ToString());
            parentTreeViewNode.ChildNodes.Add(newNode);
            AddChildTreeViewNodes(treeViewData, newNode);
        }
    }



    
    
    TreeView Database


    
    

            id="TreeView1"
        Runat="server"  />