How to Use Retrieve and Retrieve Multiple Methods with QueryExpression in Dynamics 365 CRM

1. Retrieve Method entityname: Logical name of the entity id: GUID of the record to retrieve. Columnset: Specifies which columns to retrieve. Guid accountId = new Guid("D7C72460-3A9E-4D7A-8B6D-ACD6B4693E01"); Entity account = service.Retrieve("...