private void timer1_Tick(object sender, EventArgs e)
        {
            //学习进度条控件
            this.progressBar1.Minimum = 0;//进度条最小值
            this.progressBar1.Maximum = 10000;//最大值
            this.progressBar1.Step = 1;//步进值
            //调用for循环动态显示进度条的当前进度值
            for (int i = 0; i < 10000; i++)
            {
                //performstep以设置的step步进值递增进度条当前进度
                this.progressBar1.PerformStep();
                //在文本框中显示当前进度
                this.currpos.Text = this.progressBar1.Value.ToString();
            }
        }