Check OrganizationResponse has fault in Dynamics 365 Plugin - Moazam Badane's Blog

To make your experience better when you write code, all the standard system data operations have a pair of *Request and *Response classes defined in the SDK assemblies. Each of these classes inherits from the respective OrganizationRequest and OrganizationResponse classes and provide a more productive experience for you when you write code.

One thing that needs to take care of is to manage faults in OrganizationResponse.

Example: Create Retrieve Multiple Request

Check Fault in OrganizationReponse using Extension Method CheckFault(this OrganizationResponse ResponseItemObj)