score:3

Accepted answer

Following a previous answer such as Linq to Sql: Multiple left outer joins you can see the structure for solving this eg something like:

var result = from customer in customers  
                   from personalFirst in personal  
                       .Where(pf => pf.Field == "First Name" && pf.C_ID == customer.C_ID)  
                       .DefaultIfEmpty() 
                   from personalLast in personal  
                       .Where(pl => pl.Field == "Last Name" && pl.C_ID == customer.C_ID)  
                       .DefaultIfEmpty()  
                    where customer.C_ID == 2  
                    select new { customer.C_ID, Name = (personalFirst != null ? personalFirst.Value : "") + " " + (personalLast != null ? personalLast.Value : "") };  

Obviously if you want all records then remove the restriction on C_ID = 2


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