[C#] How to shorten link with bitly Winform

using BitlyAPI;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ShortenLinkBitly
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private async void btnCreate_Click(object sender, EventArgs e)
        {
            var bitly = new Bitly("19ae7ac3e2912e4b688eafd1848e308cb20f082c"); // your accss token
            var linkResponse = await bitly.PostShorten(txt_long_link.Text.Trim());
            var newLink = linkResponse.Link;
            lbl_short_link.Text = newLink;
        }

        private void btn_copy_Click(object sender, EventArgs e)
        {
            Clipboard.SetText(lbl_short_link.Text);
        }

        private void lbl_short_link_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            Process.Start(lbl_short_link.Text);
        }
    }
}