How to store a variable after form closes for use later on another form - vb.net

Question

So I am building a form based application, and I am running into an issue with passing data between forms. I have a combo box that, based on selection, triggers a new form to open with several buttons to pick from. Once you select a button, the form closes, but I can't get the selection to be carried over to the original form.
basic idea of the code is like this
Public Class frmMain
Public intStore As integer
Private Sub cboSample_SelectedIndexChanged(sender As Object, e As EventArgs) Handles cboSample.SelectedIndexChanged
Dim selection as Integer
selection = cboSample.SelectedIndex
If selection = -1 Then
Else
Select Case selection
Case 0
frmOne.Show()
Case 1
frmTwo.Show()
End Select
End If
End Sub
End Class
Here is a sample of the second form code
Public Class frmOne
Public storage As varStorage
Private Sub btn_Clicked(sender As Object, e As EventArgs) Handles btn.Clicked
storage = New varStorage With {.datastore = 1}
Me.Close()
End Sub
End Class
frmTwo is pretty much the same but handles more options
The Class I created looks like this
Public Class varStorage
Public _dataStore As Integer
Public Property dataStore() As Integer
Get
Return _dataStore
End Get
Set (value As Integer)
_dataStore = value
End Set
End Property
End Class
as I said, the issue comes from the point of the form being called, and the form closing, the variable data is not being saved. I am almost certain I am missing some code somewhere, but not sure where. any help would be greatly appreciated.

Answer 1

Rather than using Show() to open another form, using ShowDialog() will open the form modally. The form will behave like a MessageBox. It will wait for you to respond to, and close, this form before returning to your main form. We can obtain a value from this modal-form, safe in the knowledge that the form has been closed (and so the value we have obtained will not be changed).
The other way is to make a Public Property of the form. then you can create Get and Set methods to have access to your form objects
Public Class yourFormClass
Public Property Note As String
Get
Return txtNote.Text
End Get
Set(value As String)
End Set
End Property
End Class
and Then you can use it like
dialog = New yourFormClass()
someOtherTextbox.Text = dialog.Note