customer Error Messages

testsubject · March 1st, 2006, 10:27 AM

Hi folks,

Right I have got a really good question for you now. I have created a number of Web Applications using Visual Studio 2005 (VB Language) and i am wanting to control the error pages (messages) that can appear.

Basically when users are using my web applications they can sometimes receive a ERROR [28000] [IBM][iSeries Access ODBC Driver] error message, which instead of having this page it redirects them to a different page and not the standard error message page.

I hope this makes sense.

Thanks

Imar · March 1st, 2006, 03:20 PM

Hi there,

You can customize the <customErrors> section in the web.config file, so on server errors (statuscode 500) the user is transferred to Error.aspx. In Error.aspx you can access the exception that occurred using Server.GetLastError().GetBaseException() and then diagnose the error.

For some errors, you can then customize your error message, or even redirect to an entirely different page.

However, it seems that you know in advance that certain exceptions can occur. Wouldn't it be much better to use a Try Catch block, catch the known exceptions and handle them at the class level?

Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.
While typing this post, I was listening to: Johnny, Kick A Hole In The Sky by Red Hot Chili Peppers (Track 13 from the album: Mother's Milk) What's This?

testsubject · March 2nd, 2006, 04:31 AM

Hi Imar,

Thanks for that. Basically what I am trying to catch is.... I have a login page which supplies the username and password into two session variables that are then passed into data connection string to connect to a huge database. Now I know that if the username or password is incorrect it will kickup a error about incorrect username or password, and its this that I am trying to catch so I can then re-direct them to a custom error page.

You have a code example in mind so I see exactly what can be done...

Thanks

Imar · March 2nd, 2006, 04:36 AM

Something like this?

Code:

try
{
  // Open database here
}
catch (Exception ex)
{
  // Whooops, something went wrong
}

When you run this code the first time, you can diagnose the ex variable to see what type it is. Then you can add an additional catch block to catch that exception separately, and redirect to another page.

Look in the help for more information about try/catch and how to define multiple catch blocks....

HtH,

Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.

testsubject · March 2nd, 2006, 05:43 AM

Just tried this:

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'Put user code to initialize the page here
        Try
            cnBarwickPas.Open()
        Catch e As Exception
            Console.WriteLine("An error occurred: '{0}'", e)
        End Try

        cnBarwickPas.Close()
    End Sub

And got Variable 'e' hides a variable in an enclosing block.

Now i havent used try/catches before so a little unclear about it all but reading from the example in the help, the above code catches all errors.

Any help would be great.

Thanks

testsubject · March 2nd, 2006, 06:03 AM

Sorry, ignore the last post, I made a big cockup.