How to get user photo in C# using Graph API?

I found the solution to this issue in one of the Richard diZerega's sample bots. Following is the way you display the user's photo in bot.

Get the byte array of the user's photo by using Graph API.

// Extension method
public static async Task<byte[]> GetStreamWithAuthAsync(this HttpClient client, string accessToken, string endpoint)
        {
            client.DefaultRequestHeaders.Add("Authorization", "Bearer " + accessToken);
            client.DefaultRequestHeaders.Add("Accept", "application/json");
            using (var response = await client.GetAsync(endpoint))
            {
                if (response.IsSuccessStatusCode)
                {
                    var stream = await response.Content.ReadAsStreamAsync();
                    byte[] bytes = new byte[stream.Length];
                    stream.Read(bytes, 0, (int)stream.Length);
                    return bytes;
                }
                else
                    return null;
            }
        }

Assign the above byte array with the prefix "data:image/png;base64," and assign it to image URL property.

// Get the users profile photo from the Microsoft Graph
var bytes = await new HttpClient().GetStreamWithAuthAsync(token, "https://graph.microsoft.com/v1.0/me/photo/$value");
var pic = "data:image/png;base64," + Convert.ToBase64String(bytes);

ThumbnailCard card = new ThumbnailCard()
 {
    Title = $"{((JValue)jItem["Subject"]).Value}",
    Subtitle = jItem.SelectToken("sender.emailAdress.name").ToString(),
    Text = jItem.SelectToken("body.content").ToString(),
    Images = new List<CardImage>()
    {
          new CardImage()
          {
                Url= pic
          }
    }
 };
 return card;