In my custom code I have used checks at many places, like checking for dataset tables count..

example:
Dataset ds = ...

if (ds.Tables.Count > 0)
{
.....
}

After I upgraded to 4.1.3 ..I am getting error like object reference not instantiated...I am naive with this CMS and cant understand is there any changes related to dataset has been done in the code base....

If you have any work around suggestions please let me know..

Thanks a lot in advance.

Sid