Hi ahmadsubuhanlubis,

Using this article i have created the example.

Using ASP.Net Menu control with example in C# and VB.Net

Please refer below sample code.

HTML

<asp:TextBox ID="txtMenu" runat="server"></asp:TextBox>
<asp:Button ID="btnSearch" runat="server" Text="Search" OnClick="OnSearch" />
<hr />
<asp:Menu ID="menu1" runat="server" DataSourceID="SiteMapDataSource1" Orientation="Horizontal"
    OnMenuItemDataBound="OnMenuItemDataBound">
    <LevelMenuItemStyles>
        <asp:MenuItemStyle CssClass="main_menu" />
        <asp:MenuItemStyle CssClass="level_menu" />
    </LevelMenuItemStyles>
</asp:Menu>
<asp:SiteMapDataSource ID="SiteMapDataSource1" runat="server" ShowStartingNode="false" />

Code

C#

protected void OnMenuItemDataBound(object sender, MenuEventArgs e)
{
    if (SiteMap.CurrentNode != null)
    {
        if (e.Item.Text == SiteMap.CurrentNode.Title)
        {
            if (e.Item.Parent != null)
            {
                e.Item.Parent.Selected = true;
            }
            else
            {
                e.Item.Selected = true;
            }
        }
    }
}

protected void OnSearch(object sender, EventArgs e)
{
    string message = "Menu item not found.";
    MenuItem item = menu1.FindItem(txtMenu.Text);
    if (item != null)
    {
        message = item.Text + " found at depth " + item.Depth.ToString() + ".";
    }
    else
    {
        foreach (MenuItem menuItem in menu1.Items)
        {
            if (menuItem.Text.ToLower() == txtMenu.Text.ToLower())
            {
                message = menuItem.Text + " found at depth " + menuItem.Depth.ToString() + ".";
                break;
            }
            if (SearchChildItem(txtMenu.Text, menuItem) != null)
            {
                MenuItem childItem = SearchChildItem(txtMenu.Text, menuItem);
                message = childItem.Text + " found at depth " + childItem.Depth.ToString() + ".";
                break;
            }
        }
    }

    ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('" + message + "');", true);
}


private MenuItem SearchChildItem(string searchText, MenuItem menuItem)
{
    foreach (MenuItem childItem in menuItem.ChildItems)
    {
        if (childItem.Text.ToLower() == searchText.ToLower())
        {
            return childItem;
        }
        else
        {
            SearchChildItem(searchText, childItem);
        }
    }

    return null;
}

VB.Net

Protected Sub OnMenuItemDataBound(ByVal sender As Object, ByVal e As MenuEventArgs)
    If SiteMap.CurrentNode IsNot Nothing Then
        If e.Item.Text = SiteMap.CurrentNode.Title Then
            If e.Item.Parent IsNot Nothing Then
                e.Item.Parent.Selected = True
            Else
                e.Item.Selected = True
            End If
        End If
    End If
End Sub

Protected Sub OnSearch(ByVal sender As Object, ByVal e As EventArgs)
    Dim message As String = "Menu item not found."
    Dim item As MenuItem = menu1.FindItem(txtMenu.Text)
    If item IsNot Nothing Then
        message = item.Text & " found at depth " + item.Depth.ToString() & "."
    Else
        For Each menuItem As MenuItem In menu1.Items
            If menuItem.Text.ToLower() = txtMenu.Text.ToLower() Then
                message = menuItem.Text & " found at depth " + menuItem.Depth.ToString() & "."
                Exit For
            End If

            If SearchChildItem(txtMenu.Text, menuItem) IsNot Nothing Then
                Dim childItem As MenuItem = SearchChildItem(txtMenu.Text, menuItem)
                message = childItem.Text & " found at depth " + childItem.Depth.ToString() & "."
                Exit For
            End If
        Next
    End If

    ClientScript.RegisterClientScriptBlock(Me.GetType(), "alert", "alert('" & message & "');", True)
End Sub

Private Function SearchChildItem(ByVal searchText As String, ByVal menuItem As MenuItem) As MenuItem
    For Each childItem As MenuItem In menuItem.ChildItems
        If childItem.Text.ToLower() = searchText.ToLower() Then
            Return childItem
        Else
            SearchChildItem(searchText, childItem)
        End If
    Next

    Return Nothing
End Function

Screenshot