窗体异步示例

public partial class Form1 : Form
{
    private delegate void FlushClient();//代理

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        FlushClient fc = new FlushClient(ThreadFunction);
        fc.BeginInvoke(null, null);
    }

    private void ThreadFunction()
    {
        while (true)
        {
            this.textBox1.Text = DateTime.Now.ToString();
            Thread.Sleep(1000);
        }
    }

}