Bing Ads .NET SDK 13.0.20 includes performance improvements such as lower latency and reduced network traffic when calling Bing Ads services.
This is achieved by internally switching the SDK from the existing XML-based SOAP API to a new JSON-based REST API.
When upgrading to this version we recommend that you test your application to make sure it’s compatible with the implementation changes made in this release.
For more details, please see Upgrading to Bing Ads .NET SDK 13.0.20.