Webservice error if more than 1800 records in returned dataset

[Richard]

I have a webservice which returns a dataset from an SQL database to winforms
client.

All has been working fine for some time now but since my datasets have
increased to over 1800 records an error is now thrown on the client side
stating the "the root element is missing" when returning tables of this
size. I can test the ASMX file using a web browser and the whole dataset is
displayed in XML there in the browser, but when it is called as a webservice
from my program it falls apart.

This happens whether I return the data as a XmlDocument, string, or DataSet.

Can anyone tell me why this would happen and what I can to to fix it?

Best Regards

Richard