[Bot Framework] How to reply an image

There are 2 ways to achieve that goal.

First one, pass image url to channel

if my source url is like

http://abc.com/dog.png

               var reply = context.MakeMessage();                

               reply.Attachments.Add(new Attachment

                {

                    ContentUrl = $"http://abc.com/dog.png",

                    ContentType = "image/png",

                });

Pass base64 encoded image data

                Stream fs = File.OpenRead("C:\\dog.png");

                byte[] img = fs.ToArray();         

                string ima64 = Convert.ToBase64String(img);

                var reply = context.MakeMessage();

                reply.Attachments.Add(new Attachment

                {

                    ContentUrl = $"data:image/png;base64,{ima64}",

                    ContentType = "image/png",

                });

Or you can add image into Card

                var card = new HeroCard

                {

                    Title = employee.Name,

                    Text = $"Title: {employee.Title}, Phone: {employee.PhoneNumber}",

                    Images = new List<CardImage>() { new CardImage { Url = $"data:image/png;base64,{image}" } },

                }.ToAttachment();