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Asked: 2026-06-16T00:29:15+00:00

For some reason, all of the objects in my ASP.NET markup are now null

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For some reason, all of the objects in my ASP.NET markup are now null when I try to assign values to their properties in the code behind.

My project was going fine and then now when I try to assign a data source to a GridView, I get a null reference error.

I have no idea why it’s doing this. I am not doing nothing special. I am just trying to assign a value to a property to an asp.net element in on the page. The intellisense knows that the element is there and I get no errors when I build the project. It’s just when I am running the website I get the null reference.

I have been trying to fix this issue for a couple weeks now. Please Help.

Thanks.

Here is the code:

protected void Page_PreRender(object sender, EventArgs e)
{
    LoadData();
}

private void LoadData()
{
    Entities context = new Entities();
    var types = (from t in context.CustomerTypes
                 select t).OrderBy(t => t.TypeName);

    gvCustomerTypes.DataSource = types;
    gvCustomerTypes.DataBind();

}

and on in the markup the gridview looks like this:

<asp:GridView ID="gvCustomerTypes" runat="server" ShowHeader="true" GridLines="Both"
    AutoGenerateColumns="false" AlternatingRowStyle-BackColor="AliceBlue" Width="100%">
    <Columns>
        <asp:TemplateField HeaderText="Customer Type Name" HeaderStyle-HorizontalAlign="Left"
            ItemStyle-HorizontalAlign="Left">
            <ItemTemplate>
                <asp:Label ID="lblType" runat="server" Text='<%# Eval("TypeName") %>' />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Edit" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
                <asp:HyperLink ID="HyperLink1" NavigateUrl='<%#Eval("CustomerTypeID", "CreateEditCustomerType.aspx?ID={0}") %>'
                    Text="Edit" runat="server" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Delete" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
                <asp:LinkButton ID="LinkButton1" CommandName='<%#Eval("CustomerTypeID") %>' OnClientClick="javascript:return confirm('Are you sure you want to delete this Customer Type?');"
                    OnCommand="DeleteCustomerType" Text="Delete" runat="server" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
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1 Answer

  1. Editorial Team

    I solved this issue!! YAY!

    I had a master page with a LoginView control.

    In the loggedin view of the LoginView control is where I put the content place holder for pages that use that master page. So all the controls were return null because of the loggedin view template for the LoginView control.

    I am not completely sure why this does this but at least I found out my null reference problem.

    Hope this saves someone else a headache.

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