Registration From NullReference Exception

Question

I am trying to do my first web application using Visual Studio 2010 and Visual Basic as programming language. In my website, I have to do a Registration Form. When I tried to register a user in the application it always shown me an message error:

NullReference Exception was unhandled by the user code. Object reference not set to an instance of an object..

The problem is with the line of code: IF dr.HasRows Then Can someone help me please. Thanks a lot

Dim dr As SqlDataReader = 
 userDS.RegisterUser(txtUname.Text, strPwd, txtFname.Text, txtLname.Text,
    txtStreet.Text, txtTown.Text, txtCity.Text, txtTel.Text, txtEmail.Text)

If dr.HasRows Then
        Do While dr.Read()
            Session("userid") = dr.Item("User_ID").ToString()
            Session("username") = dr.Item("User_Name").ToString()
            Session("access") = dr.Item("Access").ToString()
        Loop
        'MsgBox("Welcome to MauriAuctions,  " & Session("username") & "! Your registration was successfully", MsgBoxStyle.Information, "Information")
        MesgBox("Welcome to MauriAuctions,  " & Session("username") & "! Your registration was successfully")

        If Session("location") = "POSTITEM" Then
            Response.Redirect("postItem.aspx")
        ElseIf Session("location") = "PLACEBID" Then
            Response.Redirect("placeBid.aspx?item_id=" & Session("itemId"))
        Else
            'Redirect on home page
            Response.Redirect("home.aspx")
        End If
    Else
        'MsgBox("An error was encountered when trying to register", MsgBoxStyle.Critical, "Error")
        MesgBox("An error was encountered when trying to register")
    End If

You can't use MsgBox in a web application: it shows the message on the server, not on the client. — Andrew Morton, May 19 '14 at 19:33
You will need to debug userDS.RegisterUser to see why it isn't returning a valid SQLDataReader — Bender, May 19 '14 at 21:37

Registration From NullReference Exception

0 Answers0