Text from form not appearing in message need to join names

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C#

ASP.NET

Sent messages from form however 'name' didnt appear only

Hi, Thank You for registering

Nees to Join names

WebClient client = new WebClient();
string name, mobile;

name   = txt_Zfname.Text+' '+ txt_Zlname.Text;
mobile = txt_Mobil.Text;
string url = "http://tintira.com:3002/cgi-bin/sendsms?password=niiamuh&user=fredquaye&from=USIS&"+
        "from=USIS&to=" + mobile +
        "&text=Hi " + name + ", Thank You for registering";
client.OpenRead(url);

Please correct the above

Thanks

What I have tried:

Checked my own codes and reviewed some codes online