how to download latest data in maxmind ubuntu code example

Example: visual studio 2019 how to make geoip

{
            WebClient wc = new WebClient { };
            string geoip = wc.DownloadString("https://api.c99.nl/geoip?key=<key>&host=1.1.1.1" + textBox6.Text);
            MessageBox.Show(this, geoip);
        }