Manage null with LINQ

Question

With this code

 var res = (from p in list where 
           p.FirstName.ToUpper() == firstName.ToUpper() || 
           p.LastName.ToUpper() == lastName.ToUpper() select p).ToList<Client>();

The p.FirstName, or the firstName can be NULL how can I manage this ?

Thanks,

Answer 1

Like this:

where String.Equals(p.LastName, lastName, StringComparison.OrdinalIgnoreCase)