[Solved] Send SMS using Fast2SMS API in ASP.Net C#

Thank you , I Got Reference to resolve . Here is my Solution

                string authKey = ""
               
                string mobileNumber = "";
               
                string senderId = ""
               
                string message = HttpUtility.UrlEncode("");

               
                StringBuilder sbPostData = new StringBuilder();
                sbPostData.AppendFormat("authkey={0}", authKey);
                sbPostData.AppendFormat("&mobiles={0}", mobileNumber);
                sbPostData.AppendFormat("&message={0}", message);
                sbPostData.AppendFormat("&sender={0}", senderId);
                //sbPostData.AppendFormat("&route={0}", "");
                //sbPostData.AppendFormat("&unicode={0}", "");

                try
                {
                    //Call Send SMS API
                    string sendSMSUri = "https://api.msg91.com/api/";
                    //Create HTTPWebrequest
                    HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create(sendSMSUri);
                    //Prepare and Add URL Encoded data
                    UTF8Encoding encoding = new UTF8Encoding();
                    byte[] data = encoding.GetBytes(sbPostData.ToString());
                    //Specify post method
                    httpWReq.Method = "POST";
                    httpWReq.ContentType = "application/x-www-form-urlencoded";
                    httpWReq.ContentLength = data.Length;
                    using (Stream stream = httpWReq.GetRequestStream())
                    {
                        stream.Write(data, 0, data.Length);
                    }
                    //Get the response
                    HttpWebResponse response = (HttpWebResponse)httpWReq.GetResponse();
                    StreamReader reader = new StreamReader(response.GetResponseStream());
                    string responseString = reader.ReadToEnd();

                    Response.Write(responseString + "");

                  
                    reader.Close();
                    response.Close();
                }
                catch (SystemException ex)
                {
                    Response.Write(ex.Message.ToString());
                }