如何更改.NET WebClient对象的超时

using System;
using System.Net;

class Program
{
    static void Main()
    {
        WebClient webClient = new WebClient();

        // 设置超时为5秒（5000毫秒）
        webClient.Timeout = 5000;

        try
        {
            string result = webClient.DownloadString("https://www.example.com");
            Console.WriteLine(result);
        }
        catch (WebException ex)
        {
            if (ex.Status == WebExceptionStatus.Timeout)
            {
                Console.WriteLine("请求超时");
            }
            else
            {
                Console.WriteLine("请求出错：" + ex.Message);
            }
        }
    }
}