Child calls parent class and gets error

[robbremington]

Error:
Reference to a non-shared member requires an object reference.
Question:
How do I amend this code to make it work?

Public Class Form1
Inherits System.Windows.Forms.Form

Dim NewClass1 As Class1
Private Sub Form1_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
NewClass1 = New Class1()
Call NewClass1.Class1Sub() ***** Call Class1Sub
End Sub
Public Sub Form1Sub()
TextBox1.Text = "Yes"
End Sub
End Class
Public Class Class1
Public Sub Class1Sub()
Form1.Form1Sub() ****** this line is highlighted in error
End Sub
End Class

 

[Heiko]

Class1 knows no object with the name Form1.

 

[robbremington]

I know that, but what code do I add to make it work?

 

[Heiko]

Public Class Form1
Inherits System.Windows.Forms.Form

Dim NewClass1 As Class1

Private Sub Form1_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
NewClass1 = New Class1(me)
Call NewClass1.Class1Sub() ***** Call Class1Sub
End Sub
Public Sub Form1Sub()
TextBox1.Text = "Yes"
End Sub
End Class

Public Class Class1

private mParentObject as Form1

Public Sub New (ByRef myParent as Form1)
 myclass.New()
 mParentObject = myParent
end Sub

Public Sub Class1Sub()
mParent.Form1Sub() 
End Sub
End Class