ASS8.Klient.Form2.btnZapisz_Click C# (CSharp) Метод

        private void btnZapisz_Click(object sender, EventArgs e)
        {
            if(!chbProxy.Checked)
               WebRequest.DefaultWebProxy = null;
            int tmp;
            if (chbProxy.Checked && (txtSerwer.Text == "" || txtPort.Text == "" || !Int32.TryParse(txtPort.Text, out tmp)))
            {
                MessageBox.Show("Ustaw poprawnie proxy");
                return;
            }
            if (chbProxy.Checked && chbUwierzytelnienie.Checked && (txtLogin.Text == "" || txtHaslo.Text == ""))
            {
                MessageBox.Show("Ustaw poprawnie proxy");
                return;
            }

            if (chbProxy.Checked)
            {
                WebProxy wp = new WebProxy(txtSerwer.Text + ":" + txtPort.Text, chbUwierzytelnienie.Checked);
                if (chbUwierzytelnienie.Checked)
                    wp.Credentials = new NetworkCredential(txtLogin.Text, txtHaslo.Text);
                WebRequest.DefaultWebProxy = wp;
            }
            else
            {
                WebRequest.DefaultWebProxy = null;
            }
            log.zmianaProxy(chbProxy.Checked ? 1 : 0, txtSerwer.Text, Int32.Parse(txtPort.Text), chbUwierzytelnienie.Checked ? 1 : 0, txtLogin.Text, txtHaslo.Text);
            this.Close();
        }