chap 12 page 389 step 10

Tijuana · August 14th, 2012, 08:14 PM

I get this error message when save file and open to view in browser. I followed the book exactly went over code server times.
Server Error in '/Site7' Application.
--------------------------------------------------------------------------------

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 22: End If
Line 23: End If
Line 24: Select Case Page.Theme.ToLower()
Line 25: Case "darkgrey"
Line 26: Menu1.Visible = False

Source File: C:\Users\Owner\Desktop\Site7\MasterPages\MasterPag e.master.vb Line: 24

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
lstPreferredTheme.Page_Load(Object sender, EventArgs e) in C:\Users\Owner\Desktop\Site7\MasterPages\MasterPag e.master.vb:24
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +50
System.Web.UI.Control.LoadRecursive() +141
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627

Imar · August 15th, 2012, 12:00 PM

Hi there,

Can you post the full code for the master page (markup and code behind), the BasePage and the web.config file?

If you post code, can you please paste it in Notepad first to remove color coding and then use the forum editor's Code toolbar button to wrap your code in code tags. Otherwise, this forum messes up the code.

Cheers,

Imar

Tijuana · August 15th, 2012, 01:11 PM

This is master page
<%@ Master Language="VB" CodeFile="ManagementMaster.master.vb" Inherits="MasterPages_ManagementMaster" %>
<!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">
<title>Untitled Page</title>
<asp:ContentPlaceHolder ID="head" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<div>
<div style="width: 200px; float: left;">
<ul>
<li><a href="~/Management/Default.aspx" runat="server">Management Home</a></li>
<li><a href="~/Management/Genres.aspx" runat="server">Manage Genres</a></li>
<li><a href="~/Management/Reviews.aspx" runat="server">Manage Reviews</a></li>
</ul>
</div>
<div style="width: 750px; float: left;">
<asp:ContentPlaceHolder ID="cpMainContent" runat="server">
</asp:ContentPlaceHolder>
</div>
</div>
</form>
</body>
</html>
and this is the web.config
<?xml version="1.0"?>

<configuration>
<appSettings/>
<connectionStrings/>
<system.web>
<pages theme=""></pages>
</system.web>
</configuration>

Imar · August 15th, 2012, 05:25 PM

Ah, this is about the Management section, right? In that case, you should not use the custom template that inherits BasePage.

Instead, you need to create a new Web Form that simple inherits System.Web.UI.Page and that uses the Management Master Page.

Cheers,

Imar