ParentChildPath.cs

public static List<string> GetEmployeePaths()
{
    List<string> employeePaths = new List<string>();
    allEmployees = GetAllEmployees();

    foreach (Employee employee in allEmployees)
    {
        employeePaths.Add(RecursivePathFinder(employee));
    }
    employeePaths.Sort();
    return employeePaths;
}

private static string RecursivePathFinder(Employee employee)
{
    if (employee.ParentEmployeeId == 0)
    {
        return employee.Name;
    }
    else
    {
        return RecursivePathFinder(allEmployees.Where(x => x.EmployeeId == employee.ParentEmployeeId).First()) + "/" + employee.Name;
    }
}