How can i handle the Linq error "Sequence contains no matching element"

Hi 

i have the linq as follows:

orderList and ordergroup are 2 lists 

  foreach (var obj in orderList)     

{   

       obj.Name = ordergroup.First(x => x.Id == obj.orderid).name;             

} 

If there is no match found then i get the above error "Sequence contains no matching element" and it throws an exception . How can i avoid this ?