problem in send data from gridview to report viewer

See more:

C#

C#4.0

Hi i want send data from gridview to report viewer
i read data from gridview and write them in datatable and send datatable to reportviewer datasource:

ReportDataSource Rds = new ReportDataSource("DataSet1", dt1);
reportViewer1.LocalReport.DataSources.Clear();
reportViewer1.LocalReport.DataSources.Add(Rds);
this.reportViewer1.RefreshReport();

but i see empty records the number records in gridview and no anything