Dynamic Menu and SubMenu "By Code" In C#

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C#

Hello,

Im trying to create a dynamic menu by code (I'm reading the menu items from a SQL database).
But the problem is that I'm not able to create a sub menu.
For example I can create a menu titled FILE and a menuItem under it titeld NEW but I can't add a menuitem (PROJECT)under the menuItem NEW.

            MainMenu MMenu = new MainMenu();
            DataTable DT_Menu = GetDataTable();

            foreach (DataRow DR in DT_Menu.Rows)
            {               
                if (Convert.ToBoolean(DR["M_Header"]) == true) 
                {
                    MenuItem MItem = new MenuItem();
                    MItem.Name = DR["M_Name"].ToString();
                    MItem.Text = DR["M_Text"].ToString();
                    MMenu.MenuItems.Add(MItem);                    
                }
                else
                {                    
                        MenuItem CMItem = new MenuItem();
                        CMItem.Name = DR["M_Name"].ToString();
                        CMItem.Text = DR["M_Text"].ToString();

                        MenuItem ExistMnu = new MenuItem();
                        ExistMnu = (MenuItem) MMenu.MenuItems[DR["M_Parent"].ToString()];
                        if (ExistMnu != null)
                        {
                            ExistMnu.MenuItems.Add(CMItem);
                        }                    
                }
            }
            Menu = MMenu;
        }

        public DataTable GetDataTable()
        {
            DataTable DT = new DataTable("MENU");

            DataColumn Pmry2 = new DataColumn("M_Parent", typeof(string));
            Pmry2.Unique = false;
            DataColumn Pmry3 = new DataColumn("M_Name", typeof(string));
            Pmry3.Unique = true;

            DT.Columns.Add(Pmry2);
            DT.Columns.Add(Pmry3);
            DT.Columns.Add("M_Text", typeof(string));
            DT.Columns.Add("M_Header", typeof(bool));

            DataColumn[] myPrimaryKeyColumns = new DataColumn[2];
            myPrimaryKeyColumns[1] = DT.Columns["M_Name"];            
            DT.PrimaryKey = myPrimaryKeyColumns;

            DT.Rows.Add("" , "File", "FILE", true);
            DT.Rows.Add("File", "New", "NEW", false);            
            DT.Rows.Add("New", "Project", "PROJECT", false);            

            return DT; 
        }
    }
}

Thanks in advance.