public class MyServiceRequestData
{
     public string DisplayNameEn { get; set; }
     public string DisplayNameFr { get; set; }
     public string DataFieldA { get; set; }
}  
          
// Retrieve the service request document.
//This function accepets a generic parameter, it's not limited to MyServiceRequestData
const int serviceRequestId = 100;
var serviceRequest = await documentManager.Get<MyServiceRequestData>(serviceRequestId);