entity framework select last month records

Question

I have employee salary table that contains :

public partial class S_EmployeeSalary
    {
        public int SalaryId { get; set; }
        public int TypeId         


        

Answer 1

looks like this part is not going to return a result since it cant be bigger and smaller than 30 at the same time.

DbFunctions.DiffDays(x.SalaryDate, DateTime.Now) > 30 && DbFunctions.DiffDays(x.SalaryDate, DateTime.Now) < 30)