Custom error web pages problem

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

This is what i am trying to do

I have a DAL that contains all of my database connections/reads etc.

I have a separate GUI layer that has my web pages

I would like to pass my exception errors in my DAL to a custom web page to
display to the user.

Here is what I have done so far

1. Created a CustomError web page that displays the error to the user in a
friendly format
2. Modified my Global.asax file to caputre the error and put it in a
Session variable.
3. Modified my Web.Config file to on error redirect my user to a custom
error page.

Problem - my error page comes up but there is no message being returned

Here is the code that I am using:

An example DAL code block throwing the exception

Public Function GetAllLevel1(ByVal ds As DataSet)

Dim myConnection As New
SqlConnection(System.Configuration.ConfigurationSettings.AppSettings("PMADataAccess"))
Dim myCommand As New SqlDataAdapter("sp_SelectAllLevel1",
myConnection)
Try
myCommand.Fill(ds, "AllLevel1")
Catch ex As Exception
Throw New System.Exception(ex.Message.ToString)
End Try
myConnection.Close()
Return ds
End Function

In Global.asax

Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
Dim LastError As Exception
LastError = Server.GetLastError()
Session("CurrentError") = LastError.Message
End Sub

In my Web.config file

<customErrors mode="On" defaultRedirect="GUI\ErrorPage.aspx"/>

In my ErrorPage.aspx.vb file

lblErrorDetails.Text = Session("CurrentError")

Now I am pretty sure that my problem has to do with context for the session,
but for the love of me I cannot figure out how to fix it. Also it seems that
the error message i am getting when i debug the Application_error routine is
a generic error message and not the system.exception message i am expecting
(example - I get the message (an unhandled exception has occured) instead of
the message (Login failed for PMAUser) when i debug the value
ex.Message.ToString in my DAL code. Why is this happening?

If anyone knows of where I can find an example of how to do what I am doing
or if you know how I can fix my Session problem I would much appreciate it.

Corey
 
Corey,

I've run into this issue before, Session appears to not be available when an
exception occurs, so using it to save the exception is not an option, you can
save the exception in the Application or the Cache objects and you can even
use the SessionID as a key.

For the second problem you mention, the ASP.NET runtime wraps all exceptions
that from ASPX pages inside an HttpUnhandledException, so if you want the
original exception all you need to use is the "InnerException" property.

HTH!
Jorge
 
Back
Top