[RESOLVED] Accessing Web Form controls from Module code?

[blakemckenna]

I know in standard VB.Net development, you can access any form field from within a module class but I'm not sure how to do it using Web Forms.

Here is my scenario:

I have a Module.vb where I am putting all my Database Functionality. In each of my functions, I'm using a Try Catch construct. Is is possible to display an error from within my Module.vb on any web form? If so, how is it done?

Thanks,

[Pradeep1210]

While you can't do a Response.Redirect etc. from within a module, the easiest way to handle such situations is to throw the exception. Then the form that called the method in the Module can handle the error and appropriately redirect to the error page.

I usually prefer not to put any Try..Catch blocks in the Module methods, and let it error out. This way, the calling form can handle the situations in its own way.
e.g. In the Page_Error event, redirect to your error page etc.

 

[blakemckenna]

Ok,

On our web forms we use an asp Label control at the top of the web page to display any messages.

So, on a form that has this label, how do I populate the label with an error message from the Page_Error Event?

Thanks,

[Pradeep1210]

Private Sub Page_Error(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Error
    Dim ex As Exception = Server.GetLastError
    Label1.Text = "Error: " & ex.Message
End Sub

[blakemckenna]

That makes sense!

Thanks Pradeep

[gep13]

Equally, this could be handled in the page, where you are actually calling into the module, rather than bubbling it up to the page level.

Gary

[Pradeep1210]

Equally, this could be handled in the page, where you are actually calling into the module, rather than bubbling it up to the page level.

Gary

Yes exactly!

Ideally you should try to handle the error from where it is called.
Only unexpected errors or common error handling routine should go in the Page Error event.

[blakemckenna]

Thanks guys!

[blakemckenna]

Ok guys,

I have a WebUserControl. In the code-behind, I have several functions that contain a Try Catch construct. In the Catch, I wish to capture any errors. I have a Label Control on the main page that shows all application errors. I want to be able to display any errors from the UC in this Label as well. Below is what my code looks like in the UC within the Catch phrase.

    Private Sub DisplayCatalog(ByVal intCatalogID As Integer)
        Try
            divProductType.Visible = False
            divResulstsPerPage.Visible = True
            divSC.Visible = True
            LoadCatalogItems(intCatalogID)

        Catch ex As Exception
            strErrMsg = "UCCatalog/DisplayCatalog() - " & ex.Message
        End Try
    End Sub

Is there a way to define a "Global" variable or something?

Thanks,

[gep13]

Hello,

There are a couple of ways that you can do this...

Probably the cleanest way would be to bubble an event from the User Control, to the containing page to indicate that "something" went wrong. Within this event bubble, you can provide information about what exactly went wrong.

An article showing how this can be achieved can be found here:

http://odetocode.com/code/94.aspx

Gary