关于rdlc报表的子报表有关问题,总是显示未提供子报表数据源实例！高手请问 急

private void Frm_Report_Load(object sender, EventArgs e)        {            rptMental.ProcessingMode = ProcessingMode.Local;            rptMental.LocalReport.ReportEmbeddedResource = @"Record.Client.Report.chic_Report.rdlc";            rptMental.LocalReport.SubreportProcessing += new SubreportProcessingEventHandler(LocalReport_SubreportProcessing);            rptMental.LocalReport.DataSources.Add(new ReportDataSource("Ds1_chic_Report", dtchic));            this.rptMental.RefreshReport();        }        void LocalReport_SubreportProcessing(object sender, SubreportProcessingEventArgs e)        {            ReportDataSource rs = new ReportDataSource();            rs.Name = "Ds1_chicDetail_Report";            rs.Value = dtchicDetail;            e.DataSources.Add(rs);        }

            ReportDataSource rs= new ReportDataSource();             rs.Name = "Ds1_chicDetail_Report";            rs.Value = dtchicDetail;            rptMental.LocalReport.DataSources.Clear();            rptMental.LocalReport.DataSources.Add(rs);