Object Reference not set to instance of object

[mtang45]

I have the following code (which I have used before with no prob) and continue to get an error that is baffling me. I'm doing a databind to a lable and passing the value to a format routine so I can control output on things like dates. Error is ...

An unhandled exception of type 'System.NullReferenceException' occurred in .....
Additional information: Object reference not set to an instance of an object.


CODE:

With m_objData
RMADataGrid.DataSource = .RMA

Dim objBinding As Binding

m_cmrRMA = _
CType(BindingContext(.RMA), _
CurrencyManager)

lblRMADate.DataBindings.Add(New _
Binding("Text", .RMA, "RMA Date"))

AddHandler objBinding.Format, _ <<< Chokes here
AddressOf FormatLabelAsDateString

........................................

Private Sub FormatLabelAsDateString(ByVal sender As Object, _
ByVal cevent As ConvertEventArgs)

If cevent.DesiredType Is GetType(String) Then
If cevent.Value Is DBNull.Value Then
cevent.Value = ""
Else
cevent.Value = Convert.ToDateTime(cevent.Value).ToString("d")
End If
End If
End Sub


Any suggestions would be most appreciated. Thanks!

[RichardAtherton]

ok different coding approach but it might help and it does work consistently:

Dim b1 As Binding = New Binding("text", ds2, "Tenancies.StartDate")
AddHandler b1.Parse, AddressOf StrDat
AddHandler b1.Format, AddressOf DatStr
DteTxtBox1.DataBindings.Add(b1)


Note: DteTxtBox1 is a custom class inherited from textbox, but all it does, is only allow valid values to be entered.

Private Sub DatStr(ByVal sender As Object, ByVal cevent As ConvertEventArgs)
If Not cevent.DesiredType Is GetType(String) Then
Exit Sub
End If
Try
cevent.Value = CType(cevent.Value, Date).ToString("dd/MM/yyyy")

Catch
' null value trap
End Try
End Sub

Private Sub StrDat(ByVal sender As Object, ByVal cevent As ConvertEventArgs)
If Not cevent.DesiredType Is GetType(Date) Then
Exit Sub
End If
cevent.Value = Date.Parse(cevent.Value)

End Sub