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Server.GetLastError is Nothing on custom error page

Posted on 2004-09-17
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Last Modified: 2008-09-30
I'm trying to write a custom error page, to display the error message within a page matching the "house style". I thought that I could use Server.GetLastError to get the exception that was thrown, but it has a value of "Nothing".

In my web.config I have:

    <customErrors mode="On"  defaultRedirect="error.aspx" />

And in the code-behind of error.aspx I have:

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Dim ex As Exception = Server.GetLastError   ' <--- ex is Nothing at this point
        lblError.Text = ex.Message

    End Sub

This is making my custom error page pretty useless. What am I doing wrong?
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Question by:crescendo
4 Comments
 
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DotNetLover_Baan earned 800 total points
ID: 12083610
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Assisted Solution

by:raterus
raterus earned 200 total points
ID: 12083964
The defaultRedirect occurs AFTER the server has processed all the error junk, if you want to get the last error, you either have to do it in Page_Error or Application_Error

--Michael
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Expert Comment

by:jimseiwert
ID: 22607662
Maybe i am missing something but i have the following code in the pack of my page, but the sub Page_error never gets called when the error page gets loaded. What am i missing?

Thank you for your patience
Imports System.Web
Imports System.Web.SessionState
Imports System.Web.Mail
Imports System.Diagnostics
Partial Class Sessions
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
 
    End Sub
    Sub Page_Error(ByVal sender As Object, ByVal e As EventArgs)
 
        Dim PageException As String = Server.GetLastError().ToString()
        Dim strBuild As New StringBuilder()
        strBuild.Append("Exception!")
        strBuild.Append(PageException)
 
        Response.Write(strBuild.ToString())
        Context.ClearError()
 
    End Sub

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LVL 16

Expert Comment

by:Gyanendra Singh
ID: 22607736
see that event called when some error comes in your page ,, nor that page is loaded .. try to throw some error on page laod and see
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