System.Net.WebException: The underlying connection was closed: A connection that was expected to be kept alive was closed by the server.
   at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at SMSSender.SendSMSNEW(String Path)
System.Net.WebException: The remote server returned an error: (400) Bad Request.
   at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at SMSSender.SendSMSNEW(String Path)
System.Net.WebException: The remote server returned an error: (400) Bad Request.
   at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at SMSSender.SendSMSNEW(String Path)