CRM 2011 Plugin Update Step

Hello Everyone,

I can not get the Owner of the existing record using the script below. The form is on Update state!!!

entity = (Entity)context.InputParameters["Target"];

EntityReference OwnerId = (EntityReference)entity["ownerid"];

Entity member = service.Retrieve("systemuser", OwnerId.Id, newColumnSet(true));

OwnerEmail

Regards,

Hussain