//导出Excel
        protected void btn_Export_Click(object sender, EventArgs e)
        {
            string yearAndMonth = string.Empty;

            if (!string.IsNullOrEmpty(txt_StartTime.Text))
            {
                yearAndMonth = DateTime.Parse(txt_StartTime.Text).ToString("yyyy-MM");
            }
            else if (!string.IsNullOrEmpty(txt_YearAndMonth.Text))
            {
                yearAndMonth = DateTime.Parse(txt_YearAndMonth.Text).ToString("yyyy-MM");
            }
            if (!string.IsNullOrEmpty(yearAndMonth))
            {
                GridDataBind();
                RG_GrossProfit.DataBind();
                string fileName = string.Format("{0}公司毛利详细", yearAndMonth);
                fileName = Server.UrlEncode(fileName);
                RG_GrossProfit.ExportSettings.ExportOnlyData = true;
                RG_GrossProfit.HorizontalAlign             = HorizontalAlign.Right;
                RG_GrossProfit.ExportSettings.IgnorePaging = true;
                RG_GrossProfit.ExportSettings.FileName     = fileName;
                RG_GrossProfit.MasterTableView.ExportToExcel();
            }
        }
 //查询
 protected void btn_Search_Click(object sender, EventArgs e)
 {
     GridDataBind();
     RG_GrossProfit.CurrentPageIndex = 0;
     RG_GrossProfit.DataBind();
 }