Just use below mentioned Custom Model with your
GetAllEmployeeInExcel() method.
using (var ContextDb = new FourMagazineEntities())
{
var employee = (from itm in ContextDb.Employees
where itm.Role == 3
select new EmployeeModel
{
Name = itm.Name,
Role = itm.Role.Value,
Address = itm.Address,
}).OrderByDescending(x => x.EmpID).ToList();
return employee;
}