C# Lambda .Contains() on multiple properties

Question

We are using the following to generate a search query (using NHibernate).

GetAll(x => x.Username.ToUpper().Contains(SEARCH)).ToList();

Is it possible to do a search (Contains) for multiple properties, something like ...

    GetAll(x => x.Username.ToUpper().Contains(SEARCH) 
        && x => x.Firstname.ToUpper().Contains(SEARCH) 
        && x => x.Lastname.ToUpper().Contains(SEARCH)).ToList();

Using C#

Answer 1

GetAll(x => x.Username.ToUpper().Contains(SEARCH) 
        && x.Firstname.ToUpper().Contains(SEARCH) 
        && x.Lastname.ToUpper().Contains(SEARCH)).ToList();

I'd imagine you'd want to do a search on OR though:

GetAll(x => x.Username.ToUpper().Contains(SEARCH) 
        || x.Firstname.ToUpper().Contains(SEARCH) 
        || x.Lastname.ToUpper().Contains(SEARCH)).ToList();