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Hierarchical MenuItem in ASP.NET


In all websites we have menus of some type or other. Here we will talk about creating a hierarchical menu using ASP.NET MenuItem.



Add a MenuItem control to the page as shown below

<form id="frmMain" runat="server">
    <div>
        <asp:Menu ID="menuHotels" runat="server"
            onmenuitemclick="menuHotels_MenuItemClick">           
        </asp:Menu>
    </div>
</form>

Code in code behind page:  As this is a sample application please ignore hard coding of connectionstring and naming convention.

using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

namespace Hotels
{
    public partial class HotelWorld : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            PopulateMenu();
        }

        public void PopulateMenu()
        {
            DataSet dst = GetMenuData();
            foreach (DataRow mchildRow in dst.Tables["Countries"].Rows)
            {
                MenuItem mchildItem = new MenuItem((string)mchildRow["name"],              mchildRow["CountryID"].ToString());
                menuHotels.Items.Add(mchildItem);
                foreach (DataRow childRow in mchildRow.GetChildRows("Children"))
                {
                    MenuItem childItem = new MenuItem((string)childRow["name"], childRow["CityID"].ToString());
                    mchildItem.ChildItems.Add(childItem);

                    foreach (DataRow Child1row in childRow.GetChildRows("Children1"))
                    {
                        MenuItem children1Item = new MenuItem((string)Child1row["name"], Child1row["HotelID"].ToString());

                        childItem.ChildItems.Add(children1Item);

                    }
                }
            }
        }
       
        DataSet GetMenuData()
        {
            SqlConnection con = new SqlConnection(@"Data Source=Server\MSSQLFULL;Initial Catalog=poc;Integrated Security=True");
            SqlDataAdapter dad1 = new SqlDataAdapter("SELECT * FROM Countries order by name", con);
            SqlDataAdapter dad2 = new SqlDataAdapter("SELECT * FROM Cities order by name", con);
            SqlDataAdapter dad3 = new SqlDataAdapter("SELECT * FROM Hotels order by name", con);
           
            DataSet dst = new DataSet();
            dad1.Fill(dst, "Countries");
            dad2.Fill(dst, "Cities");
            dad3.Fill(dst, "Hotels");
           
            dst.Relations.Add("Children", dst.Tables["Countries"].Columns["CountryID"], dst.Tables["Cities"].Columns["CountryID"]);
            dst.Relations.Add("Children1", dst.Tables["Cities"].Columns["CityID"], dst.Tables["Hotels"].Columns["CityID"]);
           
            return dst;
        }

        protected void menuHotels_MenuItemClick(object sender, MenuEventArgs e)
        {
            Session["menuArgs"] = e;
            Session["SelectedCity"] = e.Item.Value;
            Response.Redirect("~/Cities.aspx");
        }
       

    }
}

MenuItem control can have child controls and in this case we have another MenuItem control as its child.  We are reading data from database and assigning Text and Value to menuitem object and then we are adding that object as a child to the parent MenuItem.


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