To create effective applications in .NET that take advantage of Visual Studio and the AdWords API web services:
Use .NET to generate a proxy class to easily access the functionality of the Google web services.
Understand how to drill down the hierarchy of AdWords objects; for example, using campaign IDs to access AdGroups, and AdGroup IDs to access keywords.
Expect to implement applications that use the AdWords API across a wide range of AdWords objects.
Plan to test for specific values in objects within the AdWords hierarchy, such as Keyword text, and take actions (such as replacing that text) when there is a match.