In this article I will explain with an example, how to implement Bootstrap Navbar Toggle (Collapsible) Menu in ASP.Net using C# and VB.Net.
The Bootstrap Navbar Toggle (Collapsible) Menu will be populated from Database with the help of ASP.Net Menu control using C# and VB.Net.
I have made use of the following table Menus with the schema as follows.
Implement Bootstrap Navbar Toggle (Collapsible) Menu in ASP.Net
I have already inserted few records in the table.
Note: You can have as many child levels as you want, here I am using 2 Level Menu structure.
Home => Home.aspx
            Consulting => Consulting.aspx
            Outsourcing => Outsourcing.aspx
About => About.aspx
Contact => Contact.aspx
Implement Bootstrap Navbar Toggle (Collapsible) Menu in ASP.Net
Note: You can download the database table SQL by clicking the download link below.
          Download SQL file
HTML Markup
Below is the HTML Markup of the Master Page Main.Master containing inherited Bootstrap and jQuery files and an ASP.Net Menu control.
The Menu control is placed inside the Bootstrap Menu and its following properties are set in order to make it Responsive.
1. Orientation – Horizontal.
2. RenderingMode – List. This makes the menu render as an HTML List.
3. StaticMenuStyle-CssClass – The Bootstrap classes i.e. nav and navbar-nav are set.
4. DynamicMenuStyle-CssClass – The Bootstrap class dropdown-menu is set.
<link rel="stylesheet" href=''
    media="screen" />
<script type="text/javascript" src=''></script>
<script type="text/javascript" src=''></script>
<div class="navbar navbar-default">
    <div class="container-fluid">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1"
                <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span><span
                    class="icon-bar"></span><span class="icon-bar"></span>
            <a class="navbar-brand" href="#">ASPSnippets</a>
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <asp:Menu ID="Menu1" runat="server" Orientation="Horizontal" RenderingMode="List"
                IncludeStyleBlock="false" StaticMenuStyle-CssClass="nav navbar-nav" DynamicMenuStyle-CssClass="dropdown-menu">
You will need to import the following namespaces.
using System.IO;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
Imports System.IO
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Populating the ASP.Net Menu control items from database
The PopulateMenu method is a recursive function. Inside the Page Load event of the Master Page, the Menu control is populated with the records from the Menus table.
Inside the PopulateMenu method, a loop is executed over the DataTable and if the ParentMenuId is 0 i.e. the menu is a parent (root) menu, again a query is executed over the Menus table to populate the corresponding submenus and again the PopulateMenu method is called.
This process continues until all menus along with their submenus are added to the ASP.Net Menu control.
protected void Page_Load(object sender, EventArgs e)
    if (!this.IsPostBack)
        DataTable dt = this.GetData(0);
        PopulateMenu(dt, 0, null);
private DataTable GetData(int parentMenuId)
    string query = "SELECT [MenuId], [Title], [Description], [Url] FROM [Menus] WHERE ParentMenuId = @ParentMenuId";
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
        DataTable dt = new DataTable();
        using (SqlCommand cmd = new SqlCommand(query))
            using (SqlDataAdapter sda = new SqlDataAdapter())
                cmd.Parameters.AddWithValue("@ParentMenuId", parentMenuId);
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                sda.SelectCommand = cmd;
        return dt;
private void PopulateMenu(DataTable dt, int parentMenuId, MenuItem parentMenuItem)
    string currentPage = Path.GetFileName(Request.Url.AbsolutePath);
    foreach (DataRow row in dt.Rows)
        MenuItem menuItem = new MenuItem
            Value = row["MenuId"].ToString(),
            Text = row["Title"].ToString(),
            NavigateUrl = row["Url"].ToString(),
            Selected = row["Url"].ToString().EndsWith(currentPage, StringComparison.CurrentCultureIgnoreCase)
        if (parentMenuId == 0)
            DataTable dtChild = this.GetData(int.Parse(menuItem.Value));
            PopulateMenu(dtChild, int.Parse(menuItem.Value), menuItem);
Protected Sub Page_Load(sender As Object, e As EventArgs)
    If Not Me.IsPostBack Then
        Dim dt As DataTable = Me.GetData(0)
        PopulateMenu(dt, 0, Nothing)
    End If
End Sub
Private Function GetData(parentMenuId As Integer) As DataTable
    Dim query As String = "SELECT [MenuId], [Title], [Description], [Url] FROM [Menus] WHERE ParentMenuId = @ParentMenuId"
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As New SqlConnection(constr)
        Dim dt As New DataTable()
        Using cmd As New SqlCommand(query)
            Using sda As New SqlDataAdapter()
                cmd.Parameters.AddWithValue("@ParentMenuId", parentMenuId)
                cmd.CommandType = CommandType.Text
                cmd.Connection = con
                sda.SelectCommand = cmd
            End Using
        End Using
        Return dt
    End Using
End Function
Private Sub PopulateMenu(dt As DataTable, parentMenuId As Integer, parentMenuItem As MenuItem)
    Dim currentPage As String = Path.GetFileName(Request.Url.AbsolutePath)
    For Each row As DataRow In dt.Rows
        Dim menuItem As New MenuItem() With { _
          .Value = row("MenuId").ToString(), _
          .Text = row("Title").ToString(), _
          .NavigateUrl = row("Url").ToString(), _
         .Selected = row("Url").ToString().EndsWith(currentPage, StringComparison.CurrentCultureIgnoreCase) _
        If parentMenuId = 0 Then
            Dim dtChild As DataTable = Me.GetData(Integer.Parse(menuItem.Value))
            PopulateMenu(dtChild, Integer.Parse(menuItem.Value), menuItem)
        End If
End Sub
Implementing Bootstrap Navbar Toggle (Collapsible) Menu
The following script needs to be placed below the ASP.Net Menu control. The following script removes the default functionality of the ASP.Net Menu control and applies the Bootstrap CSS classes to make it Responsive.
<script type="text/javascript">
    //Disable the default MouseOver functionality of ASP.Net Menu control.
    Sys.WebForms.Menu._elementObjectMapper.getMappedObject = function () {
        return false;
    $(function () {
        //Remove the style attributes.
        $(".navbar-nav li, .navbar-nav a, .navbar-nav ul").removeAttr('style');
        //Apply the Bootstrap class to the Submenu.
        //Apply the Bootstrap properties to the Submenu.
        $(".dropdown-toggle").find("a").eq(0).attr("data-toggle", "dropdown").attr("aria-haspopup", "true").attr("aria-expanded", "false").append("<span class='caret'></span>");
        //Apply the Bootstrap "active" class to the selected Menu item.
Desktop display
Implement Bootstrap Navbar Toggle (Collapsible) Menu in ASP.Net
Mobile display
Implement Bootstrap Navbar Toggle (Collapsible) Menu in ASP.Net
Browser Compatibility

The above code has been tested in the following browsers.

Internet Explorer  FireFox  Chrome  Safari  Opera 

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