如何用代码使饼形图上数字变为百分数，而图例为何会变成这样（文字图例为正常的）

 string dbPath = @"D:\历年高考分数.db";
            string sq = @"Data Source=" + dbPath;
            m = new SQLiteConnection(sq);
            m.Open();
            SQLiteDataAdapter mAdapter = new SQLiteDataAdapter("select Volume1,Volume2 from 饼形图2", m);
            DataSet ds = new DataSet();
            mAdapter.Fill(ds);
            DataTable dt = ds.Tables[0];
            //设置图表的数据
            Chart1.DataSource = dt;
            Chart1.Series[0].ChartType = SeriesChartType.Pie;
            Chart1.Series[0].XValueMember = "Volume1";//图例数据成员列
            Chart1.Series[0].YValueMembers = "Volume2";//饼形图上数据成员列
            Chart1.Series[0].IsValueShownAsLabel = true;//
            Chart1.Series[0].IsXValueIndexed = false; 
            Chart1.Series[0].Label = "#PERCENT";
            Chart1.Series[0].LegendText = "#INDEX:#VALX";
            Chart1.Series[0].ToolTip = "#VALX";
            Chart1.DataBind();

            m.Close();

Chart1.Series[0].LegendText = "#INDEX:#VALX"
->
Chart1.Series[0].LegendText = "#PERCENT"