Question

I have this:

If String.IsNullOrEmpty(editTransactionRow.pay_id.ToString()) = False Then     stTransactionPaymentID = editTransactionRow.pay_id 'Check for null value End If 

Now, when editTransactionRow.pay_id is Null Visual Basic throws an exception. Is there something wrong with this code?

Answer 1

If you are using a strongly-typed dataset then you should do this:

If Not ediTransactionRow.Ispay_id1Null Then     'Do processing here End If 

You are getting the error because a strongly-typed data set retrieves the underlying value and exposes the conversion through the property. For instance, here is essentially what is happening:

Public Property pay_Id1 Then    Get      return DirectCast(me.GetValue('pay_Id1', short)    End Get    'Abbreviated for clarity End Property 

The GetValue method is returning DBNull which cannot be converted to a short.