The error message would help.
To troubleshoot, you'll need to do a couple of things.
1. Enable Debugging for the webservice. Do this by right-clicking on the solution, and look for a multiple project startup. You'll want to select the client project and webservice project. Make sure the start with debugging.
This will allow you to set breakpoint in the webservice and actually have the code break!
2. You can setup VS to stop on any exceptions. You can find this under Debug/Exception. Have it break on all errors. I would do this just before you make your call to the webservice. This will break the code on the line causing the error.
3. Try placing a try/catch around your update code and place a break in the catch. This will let you see the error message.
Hope this helps.
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