Use this code
HttpWebRequest webRequest = null;
string response = "";
byte[] bytes = Encoding.UTF8.GetBytes(xml);
try
{
webRequest = (HttpWebRequest)WebRequest.Create("http://api.fastalerts.in/fastclient/SMSclient.php?username=" + senderusername + "&password=" + senderpwd + "&message=" + msg + "&numbers=" + phonenumber + "&senderid=" + senderid;);
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.Method = "POST";
webRequest.Timeout = 5000;
webRequest.ContentLength = bytes.Length;
using (Stream requeststream = webRequest.GetRequestStream())
{
requeststream.Write(bytes, 0, bytes.Length);
requeststream.Close();
}
using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse())
{
using (StreamReader sr = new StreamReader(webResponse.GetResponseStream()))
{
response = sr.ReadToEnd().Trim();
sr.Close();
}
webResponse.Close();
}
}
catch(Exception ex)
{
}
return response;