How to use C# client to consume Django/Python web service (all methods are returning null)?
One thing you can do is start by building a manual proxy using WebClient, or WebRequest/WebResponse. Construct your manual proxy to send the desired data to the WS for testing.
Couple of things to check on the WSDL implementation:

The WSDL definition needs to match exactly, including case, for the C# proxy to recognize the values
Namespace definitions need to match exactly, including trailing slashes
Check the profile of the generated proxy and make sure it conforms with what your desired profile is (i.e. basic or none if needed)

If you post your generated proxy we can look at it and see if there is anything out of the ordinary.
I have a C# command-line client that I'm testing the consumption of SOAP/WSDL via Django/Python/soaplib created WSDL. I've managed to successfully connect to the web service by adding a service reference. I then call one of service's methods, and the service processes the data I send, but it returns null instead of the integer I'm expecting. Any ideas on how to get back something other than a null response? Thanks for any help or suggestions!