sample code
protected void Button2_Click(object sender, EventArgs e)
{
LocalReport localrp = new LocalReport();
ReportViewer1.ProcessingMode = ProcessingMode.Local;
ReportViewer1.Visible = true;
localrp = ReportViewer1.LocalReport;
localrp.DataSources.Clear();
localrp.ReportPath ="Report.rdlc";
DataSet ds = new DataSet();
ds = returnDs();
ReportDataSource rpt = new ReportDataSource();
rpt.Name = "DataSet1";
rpt.Value = ds.Tables[0];
localrp.DataSources.Add(rpt);
localrp.Refresh();
}
<rsweb:ReportViewer ID="ReportViewer1" runat="server" Width="100%" Height="1000"
DocumentMapCollapsed="True" ShowDocumentMapButton="false">
</rsweb:ReportViewer>
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