problem with ch 13 component

dfhaywood · July 30th, 2004, 07:02 PM

When I try and run the Hello World component in chapter 13 I get the following error:

WroxComponents.HelloVB' is not defined

I get the same error when I try and run the downloaded version.

What am I missing?

Here is the code for HelloWorldExample.aspx:
<%@ Page Language="VB" %>
<script runat="server">

    Sub Page_Load
      Dim MyVBComponent as New WroxComponents.HelloVB()
      lblMessage.Text = MyVBComponent.SayHello()

    End Sub

</script>
<html>
<head>
</head>
<body>
<form runat="server">
  <p>Our component says:</p>
  <p><asp:Label id="lblMessage" runat="server" /></p>
</form>
</body>
</html>

Here is the code for HelloWorld.vb this is compiled to HelloWorld.dll:
' HelloWorld.vb
'

Imports System

Namespace WroxComponents

    Public Class HelloVB
        Public Sub New()

        End Sub

        Public Function SayHello() As String
            Return "Hello World - I'm a VB.NET component!"
        End Function
    End Class
End Namespace

bmains · July 31st, 2004, 07:17 AM

Hello,

Is it added as a component (add reference to the HellowWorld.dll) in the ASP.NET Project?

Brian

dfhaywood · July 31st, 2004, 08:27 AM

Thanks for the reply...

I am using WebMatrix like the book says and following along with the code. So how do I add a reference to the component in the project?

czambran · August 13th, 2004, 10:06 AM

I was having the same problem and this is how you solve it. First of all I am assuming you are using the webserver option that comes with the WebMatrix. When you activate this webserver look very carefully at the directory it is using, ge: "c:\BegAsp11\chapter13". on that same directory you need to have a bin folder with the HelloWorld.dll file.
What bmains was refering to is that if you read I little further on the book they tell you how you register the component with the aspx project meaning that you can say where you want your dll to be found.

Hope this helps
Christian

bmains · August 16th, 2004, 08:03 AM

Hey,

Yes, that is what I'm referring to. You need to compile the component and put in the bin directory. This is where the project looks for all dlls that the project needs. If you need to compile a component, you need to use the vbc executable.

Brian