public IList<Employee> FindByLastName(string lastName)
    {
        IList<Employee> emps;
        var e = from emp in _ctx.Employees where emp.LastName == lastName select emp;
            emps = e.ToList<Employee>();
        return emps;
    }

public IList<Employee> GetEmployeeById(int id, bool includeOrders)
{

}

public IList<Employee> FindByLastName(string lastName)
{
    return _ctx.Employees
        .Include("Orders")
        .Where(emp => emp.LastName == lastName)
        .ToList();
}

public IList<Employee> FindByLastName(string lastName)
{
    IList<Employee> emps;
    var e = from emp in _ctx.Employees.Include("Orders") where emp.LastName == lastName select emp;
        emps = e.ToList<Employee>();
    return emps;
}