C#延时方法片段

 label4.Text = "输入非数字字符";
                //延时1秒
                DateTime now = DateTime.Now;
                int miao = now.Second;
                int nowmiao = 0;
                while (miao + 1 > nowmiao)
                {
                    DateTime on = DateTime.Now;
                    nowmiao = on.Second;
                }