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

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private async void button1_Click(object sender, EventArgs e)
        {
            try
            {
                String str = await Test();
                Console.WriteLine(str);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }

        async Task<String> Test()
        {
            throw new Exception("lalala");
        }
    }
}