A duration (in days) for which the record (including the history) of workflow executions in this domain should be kept by the service. After
            the retention period, the workflow execution will not be available in the results of visibility calls. If you pass the value NONE
            then there is no expiration for workflow execution history (effectively an infinite retention period).
             
            
Constraints:
 Declaration Syntax
 Declaration Syntax| C# | 
public string WorkflowExecutionRetentionPeriodInDays { get; set; }