ارسال پیام به کانال تلگرام توسط C#.NET

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        public static void SendTextMessageToChannel(string botToken, string channelId, string message)
        {
            var address = string.Format("https://api.telegram.org/bot{0}/sendMessage?chat_id={1}&text={2}", botToken, channelId, message);
            using (var webClient = new System.Net.WebClient())
            {
                webClient.DownloadString(address);
            }
        }

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        public static void SendFileToChannel(string botToken, string channelId, string filePath)
        {
            var fileName = System.IO.Path.GetFileName(filePath);
            var file = System.IO.File.ReadAllBytes(filePath);

            using (var httpClient = new System.Net.Http.HttpClient())
            {
                var api = string.Format("https://api.telegram.org/bot{0}/sendDocument?chat_id={1}", botToken, channelId);
                using (var multipartFormDataContent = new System.Net.Http.MultipartFormDataContent())
                {
                    var streamContent = new System.Net.Http.StreamContent(new System.IO.MemoryStream(file));
                    streamContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");
                    streamContent.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("form-data")
                    {
                        FileName = fileName,
                        Name = "document"
                    };

                    multipartFormDataContent.Add(streamContent, "document", fileName);
                    using (var messageFile = httpClient.PostAsync(api, multipartFormDataContent))
                    {
                        messageFile.Result.Content.ReadAsStringAsync();
                    }
                }
            }
        }

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        public static void SendPhotoToChannel(string botToken, string channelId, string filePath, string caption = "")
        {
            var fileName = System.IO.Path.GetFileName(filePath);
            var file = System.IO.File.ReadAllBytes(filePath);
            var captionParemater = !string.IsNullOrEmpty(caption) ? string.Format("&caption={0}", caption) : string.Empty;

            using (var httpClient = new System.Net.Http.HttpClient())
            {
                var api = string.Format("https://api.telegram.org/bot{0}/sendPhoto?chat_id={1}{2}", botToken, channelId, captionParemater);
                using (var multipartFormDataContent = new System.Net.Http.MultipartFormDataContent())
                {
                    var streamContent = new System.Net.Http.StreamContent(new System.IO.MemoryStream(file));
                    streamContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");
                    streamContent.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("form-data")
                    {
                        FileName = fileName,
                        Name = "photo"
                    };

                    multipartFormDataContent.Add(streamContent, "photo", fileName);
                    using (var messageFile = httpClient.PostAsync(api, multipartFormDataContent))
                    {
                        messageFile.Result.Content.ReadAsStringAsync();
                    }
                }
            }
        }