VB.NET Windows Form retaining values on forms

VB.NET newbie here...
I have a vb.net windows application set up. It has multiple forms, about 6 in all. There's a main menu form, and then 5 other forms to collect data. The user will collect data on each form and bounce back and forth between forms. How do I get the forms to retain the data that has been entered into the text boxes and/or other controls on the forms? For example, they might fill out a few textboxes on a form, but then need to go to a different form and fill something out... and then back to the previous form. Right now, when they come back to the form, all the data previously entered in to the text boxes is gone. I am not Closing the form, just hiding it.  

Any help would be appreciated. Thanks in advance.

This is what I have on Form1, my main menu page:

Public Class frmForm1
Dim frmVS As New frmForm2


Private Sub btnForm2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnForm2.Click

frmVS.Show()
Me.Hide()

End Sub


and then on Form2, I have a main menu button (to take me back to the main menu when they're done filling out data on the form... but maybe not completely done, so they don't want to save data yet)

Private Sub btnMainMenu_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMainMenu.Click
Dim frm As New frmForm1
frm.Show()
Me.Hide()

End Sub

End Class

so if I fill out data on Form2, and then leave it there and click the MainMenu button, I go to the main menu... but then I need to click back to Form2 and still have the data previously entered there still there in the text boxes...

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