If you have been searching and have found this then you have probably had a frustrating hour or more with an error of "No Corresponding Start Element Open". No doubt you have rebuilt your WCF service, updated the service reference, maybe even removed and re added the service reference. Still you'll have the error.
So maybe one of a couple of things are happening. If your client is not WCF then maybe the generation of the service proxy is making some parameters optional in the request or response. In this case have a read of this article to get a better idea of what is happening.
Eugene Osovetsky's Blog : Solving the "disappearing data" issue when using Add Web Reference or Wsdl.exe with WCF services
However, in my case I have WCF as the client - something else is awry. One thing to check is if you have a Dataset in your method signature. If the service call is returning null instead of a Dataset instance then this error will come up. There are a couple of options - return an empty Dataset or set the EmitDefaultValue attribute on the argument. Read more about that here No Corresponding Start Element Open
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