>When dealing with DataRows its much easier to use the Field (https://msdn.microsoft.com/en-us/library/bb360891%28v=vs.110%29.aspx) and SetField (https://msdn.microsoft.com/en-us/library/bb353039%28v=vs.110%29.aspx) extension methods instead of accessing the fields directly. You can use these methods to get or set the field to a string, nullable int, nullable datetime, etc. without needing to deal with DBNull at all. Sample VB code for retrieving a nullable datetime can be found at http://stackoverflow.com/questions/4158568/populating-a-nullable-type-from-a-datarow.

Thanks