cross thread operation invalid

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I get this error message when i create a new file: (using filesystemwatcher() )

Cross thread operation not valid: Control 'txt_folderactivity" acessed from a thread other than the thread it was created on.

VB.NET Syntax (Toggle Plain Text)
        If e.ChangeType = IO.WatcherChangeTypes.Created Then
            txt_folderactivity.Text &= "File " & e.FullPath & _
                        " has been created" & vbCrLf
        End If
        If e.ChangeType = IO.WatcherChangeTypes.Created Then
            txt_folderactivity.Text &= "File " & e.FullPath & _
                        " has been created" & vbCrLf
        End If

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