Use SUB variable in other sub - vb.net

Question

I have a Open File button that opens an INI file.
Now I would like to use the path of the file so I can click a Save Button and the file is saved.
This is the code for the Open Button:
Private Sub OpenINIButton_Click(sender As Object, e As EventArgs) Handles OpenINIButton.Click
Dim OpenDLG As New OpenFileDialog
OpenDLG.Filter = "Configuration File (*.ini)|*.ini"
OpenDLG.Title = "Open INI File"
OpenDLG.InitialDirectory = "C:\"
OpenDLG.RestoreDirectory = True
DialogResult = OpenDLG.ShowDialog
If DialogResult = Windows.Forms.DialogResult.OK Then
Dim OpenFile = OpenDLG.FileName.ToString()
wValue.Text = ReadIni(OpenFile, Isolation, Value, "")
ElseIf DialogResult = Windows.Forms.DialogResult.Cancel Then
End If
End Sub
I would like the OpenFile variable in the Save Button, the code I want to use is:
Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles saveINI.Click
System.IO.File.WriteAllText(OpenFile, "")
writeIni(OpenFile, BuildOptions, Isolation, w.Value.Text)
End Sub
But the OpenFile variable is not available.
Is there any possibility to set the OpenFile variable Global?
I cannot move it outside the SUB because the Open File button doesn't work anymore.
Thanks!

Answer 1

The solution is very simple. Just declare OpenFile outside of sub
Private OpenFile as String
Private Sub OpenINIButton_Click( ...
Remove Dim statement Dim OpenFile = replace with just OpenFile =
Optionally test whether the variable was set at the beginning of Button2_Click
If OpenFile is Nothing then Exit Sub