PC SDK Writing to RAPID data

plux3001

Hello everybody,
I have question abort developing the pc sdk application.I use VB.net,how can i writing to rapid data.

HELP ME PLS

my code:

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

Dim rapidBool As ABB.Robotics.Controllers.RapidDomain.Bool
Dim rd As ABB.Robotics.Controllers.RapidDomain.RapidData = controller.Rapid.GetRapidData("T_ROB1", "MainModule", "i")
rapidBool.Value = False
Me.master = Mastership.Request(Me.controller.Rapid)
rd.Value = rapidBool
Me.master.Dispose()
'Dim rapidBool As ABB.Robotics.Controllers.RapidDomain.Bool
'

Dim aTool As ToolData
Dim aPos As New Pos()
aPos.FillFromString("[2,3,3]")
aTool.Tframe.Trans = aPos
Using Mastership.Request(controller.Rapid)
rd.Value = aTool
End Using
End Sub

ERROR: Me.master = Mastership.Request(Me.controller.Rapid)
show at vb.net = GenericControllerException was unhandled
 
what do i do wrong