如何制作循环并修复无法访问的代码？

Question

我制作了一个小程序，它将从网站更新字符串的值并将其放入文本框中。我想我已经接近完成了，但我不确定我怎么能让它重复，我有几个错误
程序不包含静态＆＃39; Main＆＃39;适用于入口点的方法
＆＃39; Form1.textBox1＆＃39;由于其保护级别而无法访问。

  

  
• 我知道我可以通过删除异步修复静态主要问题（即使它是静态的），但是我怎么能实现一个循环？
  
• 是什么让textBox 1无法访问，我该如何解决？它是一个单独的.cs文件，包含在项目中
  

namespace WindowsFormsApp2
{
static class Program
{
    static async void Main() // program does not contain a static Main method??
    {
        Form1 Buttons = new Form1();
        HttpClient client = new HttpClient();
        try
        {
            MatchCollection matches;
            HttpResponseMessage response = await client.GetAsync("https://www.coinbase.com/api/v2/prices/USD/spot?");
            response.EnsureSuccessStatusCode();
            string responseBody = await response.Content.ReadAsStringAsync();
            string pattern = "BTC\",\"currency\":\"USD\",\"amount\":\"([^\"]*)";
            Regex responsex = new Regex(pattern);
            matches = responsex.Matches(responseBody);
            Thread.Sleep(100);
            Buttons.textBox1.Text = matches; // Form1.textBox1 is inaccessible due to its protection level
        }
        catch (HttpRequestException)
        {
            return;
        }

        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
    }
}

}

namespace WindowsFormsApp2
{
public partial class Form1 : Form
{
    public bool Play;
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Play = !Play;
        if (Play == true)
        {
            button1.Text = "Pause";
        }
        else
        {
            button1.Text = "Resume";
        }
    }

    public void textBox1_TextChanged(object sender, EventArgs e)
    {

    }
}

}