SMS application is not sending special characters asp.net mvc - asp.net

Question

I have an ASP.NET MVC application that sends SMS from the web, problem is it doesn't send some special characters such as ~!##$&, when I send something like &&&&, it doesn't send SMS, if I send something like dan&dan it will send the first dan and remove remaining character and word.
Hare is my code:
public ActionResult SendSms(SendBatch member)
{
StreamReader objReader;
WebClient client = new WebClient();
string mess = member.Message;
string cell = member.Cell;
string pass = "mypassword";
string user = "username";
string baseurl = "http://bulksms.2way.co.za/eapi/submission/send_sms/2/2.0?" + "username=" + user + "&" + "password=" + pass + "&" + "message=" + mess + "&" + "msisdn=" + cell;
WebRequest wrGETURL;
wrGETURL = WebRequest.Create(baseurl);
try
{
Stream objStream;
objStream = wrGETURL.GetResponse().GetResponseStream();
objReader = new StreamReader(objStream);
objReader.Close();
}
catch (Exception ex)
{
ex.ToString();
}
}
Hope someone can assist.

Answer 1

Because you use Get method to call SMS web service, illegal characters automatically removed from your SMS. You need to use HttpUtility.UrlEncode to encode characters before sending.

Answer 2

Thanks so much for the light, i manage to find a solution using HttpUtility.UrlEncode:
public ActionResult SendSms(SendBatch member)
{
StreamReader objReader;
WebClient client = new WebClient();
string mess = member.Message;
string cell = member.Cell;
string pass = "mypassword";
string user = "username";
string message = HttpUtility.UrlEncode(mess, System.Text.Encoding.GetEncoding("ISO-8859-1"));
string baseurl = "http://bulksms.2way.co.za/eapi/submission/send_sms/2/2.0?" + "username=" + user + "&" + "password=" + pass + "&" + "message=" + message + "&" + "msisdn=" + cell;
WebRequest wrGETURL;
wrGETURL = WebRequest.Create(baseurl);
try
{
Stream objStream;
objStream = wrGETURL.GetResponse().GetResponseStream();
objReader = new StreamReader(objStream);
objReader.Close();
}
catch (Exception ex)
{
ex.ToString();
}
}