Look at your past post about a About dialog box. Use the same idea to
get a reference of form1 in form2. Then you can use <form>.Textbox1.Text
to get or set the text.
' In form2
Dim _frm As Form1
Public Sub New(ByVal frm As Form1)
MyBase.New()
_frm = frm
End Sub
'-- Test it in form2
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Debug.WriteLine(_frm.TextBox1.Text())
End Sub