//Use the Proxy Pattern.

//The Runner class is creating an instance of PictureProxy then it's trying to get image using a wrong authentication password, then a correct authentication password.

PictureAccessor.PictureProxy picProxy = new PictureAccessor.PictureProxy();

Console.WriteLine("Trying to get the image but the authetication password is wrong...");
picProxy.Authenticate("wrongPassword");
Image firstImage = picProxy.GetImage();

if (firstImage == null)
{
Console.WriteLine("No image available. Password incorrect!");
}
else
{
Console.WriteLine("Image Name: {0}", picProxy.ImageName);
}

Console.WriteLine();

Console.WriteLine("Trying to get the image, authentication password is correct...");
picProxy.Authenticate("correctPassword");
Image secondImage = picProxy.GetImage();

if (secondImage == null)
{
Console.WriteLine("No image available. Password incorrect!");
}
else
{
Console.WriteLine("Image Name: {0}"", picProxy.ImageName);
Console.WriteLine("The final image is not returned yet, for now the 'Image Loading...' is returned.");
}

Console.WriteLine();
Console.WriteLine("Let's wait a while until the proxy is returning the final image...");
Console.WriteLine();
Thread.Sleep(5000);

secondImage = picProxy.GetImage();

if (secondImage == null)
{
Console.WriteLine("No image available. Password incorrect!");
}
else
{
Console.WriteLine("Image Name: {0}"", picProxy.ImageName);
Console.WriteLine("The final image was returned now.");
}