form1.vb referenced from module1.vb

[VBdan]

I am converting a VB6 program to VB.Net. I have a problem so
I have created a small program for just one part of the problem:

1) form1.vb called 'form1.vb'
2) a button on form1 called 'button1'
3) a textbox on form1 called 'textbox1'
4) an external source code moudule called 'module.vb'
5) a subroutine in module1.vb called 'send_message'

When I click on 'button1', it calls 'send_message' that
is in 'module1.vb'.

The only thing sub 'send_message' does is to put a
message in 'textbox1' on 'form1'.

In VB6, I would always put:

form1.textbox1.text = "In send_message"

But now in .Net, it does not work. How can I get it to do
this simple thing? My project is a lot more complicated
(as you might expect), and I have a lot of subs that do
interact with other form1 objects. If I can get this
figured out, I can handle the rest.

****************************************************
form1 code
****************************************************

Private Sub button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button1.Click
Call send_message()
End Sub


****************************************************
form1 code
****************************************************

Public Sub send_message()

' VB6 liked this, but not VB.Net

form1.textbox1.text = "In send_message"

End Sub