Last week we made some changes to the AdWords API WSDL, changing a few fields to nillable. This causes problems with certain toolkits, like the .NET Framework, for int nillable fields: the toolkit does not know how to map null values to value types such as int.
In order to make life easier for AdWords developers using those toolkits, we just altered the server behavior for maxCpc and dailyBudget: when these optional fields are unset, instead of sending null, we send nothing. This should solve the problem.
We hope that this change will help developers using the .NET Framework.
--Patrick Chanezon, AdWords API evangelist
