private static void displayTeachers()
{
Console.WriteLine("Teachers:");
if (teachers == null)
{
teachers = client.GetTeachers();
}
Dictionary <string, Teacher> teacherDictionary = client.GetTeachersIDDictionary();
for (int i = 0; i < teachers.Count; i++)
{
string name = teachers[i].FullName;
string id = teachers[i].ID.ToString();
Console.WriteLine("{0} (id: {1})", teacherDictionary[id].FullName, id);
}
}