public Shipment ReserveShipment(Guid id)
{
var shipment = Shipments.Include(s => s.Driver).Where(s => s.ShipmentID == id).First();
//Check to make sure it is not already reserved
if (shipment.Driver != null)
{
throw new InvalidOperationException("This shipment is already reserved");
}
var driver = Drivers.First(d => d.DriverID == this.driverID);
shipment.Driver = driver;
SaveChanges();
return(shipment);
}
