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Editorial Team
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Asked: 2026-06-05T15:09:56+00:00

I have a Master Page with nested pages in ASP.NET. Fairly simply I want

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I have a Master Page with nested pages in ASP.NET. Fairly simply I want to databind some hyperlinks to a gridview for the master page. This however is throwing a null reference exception when I try to set the DataSource.

  1. I tested the code on a separate page and it works as expected.
  2. When debugging I can see the Page_Load Sub hit twice, I don’t know if this is the cause
  3. I have one nested page being loaded, this is a blank page at the moment

EXCEPTION

Object reference not set to an instance of an object.

enter image description here

MASTERPAGE CODE BEHIND

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    If Not Page.IsPostBack Then
        Using model = New AccessDataModelDataContext
            Dim result = From x In model.SiteLinks
                         Where x.IsActive
                         Select x

            SiteLinks.DataSource = result
            SiteLinks.DataBind()
        End Using
    End If

End Sub

MASTERPAGE ASPX CODE

<%@ Master Language="VB" AutoEventWireup="false" CodeBehind="Site.master.vb" Inherits="Access.Manager.Site" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <link href="~/Styles/Styles.css" rel="stylesheet" type="text/css" />
    <title></title>

    <asp:ContentPlaceHolder ID="head" runat="server">
    </asp:ContentPlaceHolder>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        Site.Master
        <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
        <div class="navigation">
            Site Links
            <asp:GridView ID="SiteLinks" runat="server">
            </asp:GridView>
            </div>

        <div class="content">Site Content</div>


        </asp:ContentPlaceHolder>
    </div>
    </form>
</body>
</html>
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1 Answer

  1. Editorial Team

    One glaring issue that I see, and could be your problem, is that your GridView exists inside of your content placeholder. Generally, those placeholders are for pages to implement, not the masterpage itself.

    Move the contents of the place holder out of it:

    <body>
    <form id="form1" runat="server">
    <div>
        Site.Master
        <div class="navigation">
            Site Links
            <asp:GridView ID="SiteLinks" runat="server">
            </asp:GridView>
        </div>
        <div class="content">Site Content</div>
        <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
        </asp:ContentPlaceHolder>
    </div>
    </form>
</body>
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