.net 两个数相除计算百分比 , 保留两位小数

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            string signal = "5";            decimal value = Convert.ToDecimal(signal) / 31;            //小数据取两位            int result = (int)(Math.Round(value, 2) * 100);            this.lbSingle.Text = result + "%";

                        decimal d = (decimal)(7) / 6;                        value= Math.Round(d, 2).ToString();
 
 第二种:
CountNum = 0.0;
LeangTimeCount += int.Parse(dsStudy.Tables[0].Rows[j]["StudyearnedTmie"].ToString());
 
 if (LeangTimeCount == Count)                        {                            CountNum = 1;                        }                        else                        {                            CountNum = (LeangTimeCount / Count) * 100;                        }
CountNum.ToString("#0.#0") + "%";