webBrowser1.Navigate("Targeturl"); // url browsed using get method is used
            webBrowser1.Navigate("Targeturl?programcall=60"); // get method is used

            //you can also send xml here
            string data ="this is test sending by postdata paramer";
            byte[] bytedata= Encoding.UTF8.GetBytes(data);


            //when you send data using postdata paramer, post method is used
            webBrowser1.Navigate("Targeturl", string.Empty, bytedata, string.Empty);