send sms to mobile phone using c sharp code with out using additional software

string PhoneNumber = txtbx_Mobno.Text.Trim();
string message = "";
message = "Hi, Thank you for registering with Book Many.Your Verificationcode: " + Ver_Code;
                      string sms = "http://sms.companyname.com/pushsms.php?username=username&password=pwd&sender=BookMany&to=" + PhoneNumber + "&message=" + message + " &priority=2";
                      if_send_sms.Attributes["src"] = sms;