Ytukyg

I want to pass gridview data to blank crystal report.but i am getting
error "report has no tables"
i have used a button on which crystal report is to be viewed.
kindly help me
i have attached the code below:-

namespace Test

{

    public partial class Test : System.Web.UI.Page

    {

        SqlConnection con = new 

        SqlConnection(ConfigurationSettings.AppSettings["constr"].ToString());

        DataTable dt = new DataTable();

        DataSet ds = new DataSet();

        protected void Page_Load(object sender, EventArgs e)

        {

            if (!IsPostBack)

            {

                GetDegreeName();

            }

        }



        public void GetDegreeName()

        {

            try

            {

                objlog.Action = "SelectDegree";

                objlog.StrName = "Sp_records";

                dt = SchoolMarksheet_DataLayer.GetData(objlog);

                drpdegreelist.DataSource = dt;

                drpdegreelist.Items.Clear();

                drpdegreelist.DataTextField = "Degree_Name";

                drpdegreelist.DataBind();

                drpdegreelist.Items.Insert(0, new ListItem("---Select Degree--- 

                ", "0"));

            }

            catch (Exception ex)

            {



            }

        }



        public void bscitclasswise()

        {

            try

            {

                objlog.Action = "DisplayRecords";

                objlog.StrName = "Sp_records";

                objlog.Degree_Id = drpdegreelist.SelectedIndex;

                dt = SchoolMarksheet_DataLayer.GetData(objlog);



                if (dt.Rows.Count > 0)

                {



                    Gridview.DataSource = dt;

                    Gridview.DataBind();



                    ds.Tables.Add(dt);



                }

            }



            catch (Exception ex)

            {



            }

        }



        protected void btnprint_Click(object sender, EventArgs e)

        {

            // for viewing crystal report on button click

            try

            {

                CrystalDecisions.CrystalReports.Engine.ReportDocument rd = new 

                CrystalDecisions.CrystalReports.Engine.ReportDocument();

                rd.FileName = Server.MapPath("~/Report.rpt");

                rd.SetDataSource(dt);



                CrystalReportViewer1.ReportSource= rd;

                CrystalReportViewer1.DataBind();

            }

            catch(Exception ex)

            {



            }

        }      

    }

}

And how can i print this crystal report on paper?