public static void Main(){
string sContents=string.Empty;
System.Net.WebClient wc = new System.Net.WebClient();
byte[] response =wc.DownloadData("http://payamak.city/webservice/url/send.php?method=sendsms&uname=eleccenter&pass=123456&from=50001800&to=09172172039&msg=تست");
sContents=System.Text.Encoding.ASCII.GetString(response);
Console.WriteLine(sContents);