Linq query not executing

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ASP.NET

MVC3

The following is my query when am keeping brak point at Firstname and Lastname values are returning as null
Can anyone please help me out in this

var q = from s in dbContext.T1
                                join j in dbContext.T2 on s.Userid equals j.Userid
                                join k in dbContext.T3 on j.Userid equals k.Userid
                                join l in dbContext.T4 on k.Userid equals l.Userid

  select new { l.Userid,l.City, s.Firstname, k.Company, l.College, j.State, s.Lastname, j.Country };
                   
                    if (!string.IsNullOrEmpty(FirstName))
                        query = query.Where(s => s.Firstname == FirstName);



                    if (!string.IsNullOrEmpty(City))
                        query = query.Where(l => l.City == City);

                    if (!string.IsNullOrEmpty(State))
                        query = query.Where(j => j.State == State);


                    if (!string.IsNullOrEmpty(Country))
                        query = query.Where(j => j.Country == Country);


                    if (!string.IsNullOrEmpty(LastName))
                       query = query.Where(s => s.Lastname == LastName);
                        
                    
                    if (!string.IsNullOrEmpty(Company))
                        query = query.Where(k => k.Company == Company);


                    if (!string.IsNullOrEmpty(College))
                        query = query.Where(l => l.College == College);
   
      
                    var results = (from r in query.ToList() 
                                   

                                   select new
                                   {
                                       Ft = r.Firstname,
                                       Lt = r.Lastname,
                                       Ct = r.City,
                                       Co = r.Country,
                                       Com = r.Company,
                                       Col = r.College,
                                       St = r.State,
                                       Id=r.Userid
                                     
                                   }).ToArray();