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Editorial Team
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Asked: 2026-06-11T06:32:39+00:00

I am trying to debug some code in my code behind files for as

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I am trying to debug some code in my code behind files for as aspx page. I have debug set to true both in the page and in my web.config.

Can someone tell me why a) the breakpoint never fires even though the dropdown gets filled and b) why when i uncomment the msgbox it never fires and the dropdown does NOT fill.

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load

    If IsPostBack Then
        ddlCity.Items.Clear()
        Dim context As New enerteckEntities()

        'Dim query = context.DistinctCityFromZiptax(Convert.ToInt16(ddlState.SelectedValue))
        Dim query = From c In context.ziptaxes Where c.StateID = ddlState.SelectedValue Order By c.City Select c.City, c.ZipTaxId
        'MsgBox(query.Distinct().ToList())

        ddlCity.DataSource = query.Distinct().ToList()
        ddlCity.DataValueField = "ziptaxid"
        ddlCity.DataTextField = "City"
        ddlCity.DataBind()
    End If
End Sub
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1 Answer

  1. Editorial Team

    Well based on your code, you will only execute this after a PostBack and not on initial Page Load.

    MsgBox will never show up because this is not a WinForms application! You cannot use that in a web.application. If you want you can use Response.Write() or just add a dummy Label to your page and set the text property temporarily. It is the same effect.

    The easiest would be to just debug it. Make sure your breakpoints are full Red dots, and you must be in Debug mode. If you are trying to debug from IIS then you must attach to process. If you are using IIS7 (I am assuming you are) then you must go to:
    Debug Menu > Attach to Process > Find the process named “w3wp.exe” and double click on it.
    You are now attached.

    If your breakpoints are not full red dots after starting debug, then your compiled code and your debug files do not match. Do a Rebuild as opposed to a Build. Beyond that you might be having a funky problem, you can try deleting your obj and bin folders (make sure to save any third party dlls first).

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