In this section, we have the main code of the project written in C#:

namespace FacialRecognitionDoor
{
 /// <summary>
 /// General constant variables
 /// </summary>
 public static class GeneralConstants
 {
 // This variable should be set to false for devices, unlike the Raspberry Pi, that have GPU support
 public const bool DisableLiveCameraFeed = true;

// Oxford Face API Primary should be entered here
 // You can obtain a subscription key for Face API by following the instructions here: https://azure.microsoft.com/en-us/try/cognitive-services/
 public const string OxfordAPIKey = "OXFORD_KEY_HERE";

// Enter the API endpoint address.
// If you have a 'free trial' key, you can find the here: https://azure.microsoft.com/en-us/try/cognitive-services/my-apis/
 // If you have a key from Azure, find your account here: https://portal.azure.com/#blade/HubsExtension/Resources/resourceType/Microsoft.CognitiveServices%2Faccounts.
 public const string FaceAPIEndpoint = "https://westus.api.cognitive.microsoft.com/face/v1.0";
 
 // Name of the folder in which all Whitelist data is stored
 public const string WhiteListFolderName = "Facial Recognition Door Whitelist";
}

/// <summary>
 /// Constant variables that hold messages to be read via the SpeechHelper class
 /// </summary>
 public static class SpeechContants
 {
 public const string InitialGreetingMessage = "Welcome to the Facial Recognition Door! Speech has been initialized.";

public const string VisitorNotRecognizedMessage = "Sorry! I don't recognize you, so I cannot open the door.";
public const string NoCameraMessage = "Sorry! It seems like your camera has not been fully initialized.";

public static string GeneralGreetigMessage(string visitorName)
 {
 return "Welcome to the Facial Recognition Door " + visitorName + "! I will open the door for you.";
 }
 }

/// <summary>
 /// Constant variables that hold values used to interact with device Gpio
 /// </summary>
 public static class GpioConstants
 {
 // The GPIO pin that the doorbell button is attached to
 public const int ButtonPinID = 5;

// The GPIO pin that the door lock is attached to
 public const int DoorLockPinID = 4;

// The amount of time in seconds that the door will remain unlocked for
 public const int DoorLockOpenDurationSeconds = 10;
 }
}