private static void AdminOptions() { ushort option; Console.WriteLine("\r\nHello Admin\r\nChoose a option:" + "\r\n1. Show all usernames.\r\n2. Change user date." + "\r\n3. Change user role." + "\r\n4. Show users activity(no filter)." + "\r\n5. Show users activity(with filter - contains )."); Console.Write("\r\nOption: "); option = UInt16.Parse(Console.ReadLine()); Dictionary <string, int> allUsers = UserData.AllUsersUsernames(); switch (option) { case 1: ShowAllUsernames(); break; case 2: ChangeUserDate(ref allUsers); break; case 3: ChangeUserRole(ref allUsers); break; case 4: UserData.ShowUserActivity(); break; case 5: GetUserActivitiesWithFilter(); break; default: Console.WriteLine("No such option in the menu"); break; } }