Hi,
   I am consuming a web service
(http://www.ncbi.nlm.nih.gov/entrez/eutils/soap/eutils.wsdl) using C#.Net 2
and in general it works just fine. But recently I have had trouble getting a
specific method to work whenever I put a pound sign ("#") in a query string.
When I added a backslash in front of the pound sign (@"\#"), it started
failing in more graceful fashion, making me think that there was a problem
with the way the pound sign was being transmitted and that the escaped
version was closer to correct, but it is still not quite right.
  Does anyone know how else I might try encoding a pound sign to make it
work?
Thanks!
Ethan

ps. This web service is very complex. I don't suggest you try it unless you
want to spend awhile working at it. There is some documentation at
http://www.ncbi.nlm.nih.gov/entrez/query/static/esoap_help.html and I am
trying to use eSearch methods with an active history....