Accessing a variable declared in another form

Question

Can someone tell me how I access a variable outside from the form it was declared in? I've tried examples but they haven't worked.

Answer 1

There are many right ways and many wrong ways to do what you want, the two below (one code example) and one link to a demo project are but two ways to do this.
A simple example, form1 as two buttons, form2, two buttons, one text box. This replies on knowing the parent form.
Public Class Form1
Public SomeVar As String = "Karen"
Public Property SomeProp As Integer = 4
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim f As New Form2 With {.Owner = Me}
Try
f.ShowDialog()
Finally
f.Dispose()
End Try
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
MessageBox.Show(Me.SomeVar)
End Sub
End Class
Form2
Public Class Form2
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim MyParent As Form1 = CType(Me.Owner, Form1)
MessageBox.Show(MyParent.SomeProp.ToString & Environment.NewLine & MyParent.SomeVar)
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Dim MyParent As Form1 = CType(Me.Owner, Form1)
MyParent.SomeVar = Me.TextBox1.Text
End Sub
End Class
The following link has a project which is much more involved, I allow non-modal forms to pass data between the two in real time and both forms stick to each other.
https://onedrive.live.com/redir?resid=a3d5a9a9a28080d1!727&authkey=!AEQ4n6P1H4sD6QI&ithint=file%2czip
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