What is "Reference to a non-shared member requires an object reference"?

Waterharbin · November 12th, 2010, 10:52 PM

Hello,I met a strange problem here.
I use VB2008 to new a ClassLibrary project(to build a dll),then add two Windows Forms(Form1 and Form2) to the project.Add a TextBox1 to Form1.Then,When I type "Form1.TextBox1.Text" in Form2's Code editor,an error occur,it's "Reference to a non-shared member requires an object reference".There is no such problen in VB6.0,I never meet it before.

Old Pedant · November 14th, 2010, 01:08 AM

It means your Form1 is, apparently, the name of your CLASS. Unless the field TestBox1 is a SHARED member of that class, you must first create and *OBJECT* of the Form1 type and then reference the member via that.

In other words, your code looks something like this:

Code:

Class Form1
    Public Textbox1 AS TextBox
    ...
 
... then some place in your other code:
 
    Public Sub someMethod( )
        Form1.Textbox1.Text = "abc"
...

You would need to do

Code:

    Dim myForm As New Form1
    ...
    myForm.Textbox1.Text = "abc"

If you don't create the Form1 object by using

Code:

    New Form1

then the form will not be "instantiated" and so nothing can appear on the screen.

Waterharbin · November 14th, 2010, 09:48 PM

Thank you very much.I will try it as what you said.