sms gateway in .net using ValueFirst HTTP API

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.NET

how to use ValueFirst HTTP API in asp.net BY Calling below url .

HTTP API URL- http://myvaluefirst.com/smpp/sendsms?username=xxxx&password=xxxx&to=91997166xxxx&from=VFirst&udh=0&text=test&dlr-mask=19&dlr-url&category=bulk

The below code is throwing error (guid=92de113e-21fd-4a22-aedd-faeaf00e00a5&errorcode=3&seqno=9180898765)

string URL = "http://myvaluefirst.com/smpp/sendsms?username=username&pwd=ytpvtlt1&to=9180898765&from=VFirst&udh=0&text=test&dlr-mask=19&dlr-url=test.aspx&category=bulk";

WebRequest myWebRequest = WebRequest.Create(URL);
WebResponse myWebResponse = myWebRequest.GetResponse();
Stream ReceiveStream = myWebResponse.GetResponseStream();
Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
StreamReader readStream = new StreamReader(ReceiveStream, encode);
string strResponse = readStream.ReadToEnd();
Response.Write("Response from site");