C# 程序运行进度显示Lable

       public void test()
        {
            Thread.Sleep();
            string vvv = "";
            for (int i = ; i < ;i++ )
            {
                vvv = vvv  +i.ToString() + "\r\n";
                lblTip.Text = "已完成：[" + ((float)i* / (float)).ToString("0.00") + "%]...的数据";
                Application.DoEvents();
            }
            this.textBox1.Text = vvv;
        }