print current record in crystal report without print preview

i have used below code to print current record but getting error "Report Load Faild" kindly guide me where is mistake. i am loading this method in save button after ExcecuteNonQuery.

private void PrintReport()
{
SqlConnection con = new SqlConnection(this.con);
SqlDataAdapter sda = new SqlDataAdapter("Select * from S_TEST Where S_ID='" + TxtAutovID.Text + "'", con);
DataSet ds = new DataSet();
sda.Fill(ds);
ReportDocument rpd = new ReportDocument();
rpd.Load(Server.MapPath("~/studentpass.rpt"));
rpd.SetDataSource(ds.Tables[0]);
CrptViewer.ReportSource = rpd;
rpd.PrintToPrinter(1, false, 0, 0);
}