Hoe to pass text box values to report viewer in c#

Hi,

     I m newer to report viewer , i dont know how to send text box values to report viewer Please help me....

i used some coding but i got error as :  An error occurred during local report processing

            ReportParameter p1 = new ReportParameter("Error_1", "hai");
            ReportParameter p2 = new ReportParameter("Error_2", "hello");
            this.reportViewer1.LocalReport.SetParameters(new ReportParameter[] { p1, p2 });