/// <summary>
    /// LoadLeftMenu
    /// </summary>
    private void LoadLeftMenu()
    {
        CommonDb db = new CommonDb();
        //Create the connection and DataAdapter for the Authors table.
        SqlConnection cnn = db.OpenConnection();

        SqlDataAdapter cmd1 = new SqlDataAdapter("select * from Category", cnn);

        //Create and fill the DataSet.
        DataSet ds = new DataSet();

        cmd1.Fill(ds, "Category");

        //Create a second DataAdapter for the Titles table.
        SqlDataAdapter cmd2 = new SqlDataAdapter("select * from SubCategory", cnn);

        cmd2.Fill(ds, "SubCategory");

        //Create the relation bewtween the Authors and Titles tables.

        ds.Relations.Add("myrelation",
                         ds.Tables["Category"].Columns["CategoryId"],
                         ds.Tables["SubCategory"].Columns["CategoryId"]);
        ds.Relations[0].Nested = true;

        //Bind the Authors table to the parent Repeater control, and call DataBind.
        parentRepeater.DataSource = ds.Tables[0];
        parentRepeater.DataBind();
    }