Visual Basic 2008 : Coding Exit [Messages Box]

If MsgBox("do you want to quit?", MsgBoxStyle.Question + MsgBoxStyle.YesNo, "exit") = MsgBoxResult.Yes Then
   MsgBox("thank you!!", MsgBoxStyle.Information, "end")
      End
ElseIf MsgBoxResult.No Then
       MsgBox("try again", MsgBoxStyle.Critical, "retry")
      End If
            End Sub