[2088]Incorrect VB Code Analysis???

In the following code R# marks the variable "templateName" with the message "Value assigned is not used in any execution path":

Private Sub ReadFromFile()
    Dim templateName As String
    ...
    templateName = dlgOpen.FileName
    Using reader As New StreamReader(templateName)
    ...
    End Using
End Sub

but the value is used to initialize the StreamReader. Why does R# show the message? Is this a bug or do i misinterpret the code?

Regards
Klaus