Pass gridview to Crystal report with dataset? asp .net c # webform

Hi, I have a webform project in asp .net with c #, and in it I have an sql query to show data from several tables in a gridview (I did not put the complete sql query because it is a lot and it is from my work), and I want to export that table to a crystal report by clicking on a button.

But when I run my project and click on the button, nothing is displayed or displayed.

Here I leave my code:

webform1.aspx

    <emptydatatemplate>
        ¡No se encontraron reportes!  
    </emptydatatemplate>                

    <Columns>
         <%--campos...--%>
        <asp:BoundField DataField="campo1" HeaderText="campo1" ReadOnly="True" SortExpression="campo1" />

webform1.aspx.cs

--- so I fill my gridview ---

SqlConnection with = new SqlConnection (ConfigurationManager.ConnectionStrings ["cn"]. ToString ());             con.Open ();             SqlCommand cmd = new SqlCommand ("SELECT * from table where cod = '" + Session ["Cod_user"] + "', with);             SqlDataAdapter da = new SqlDataAdapter (cmd);             DataTable dt = new DataTable ();             da.Fill (dt);             grid1.Visible = true;             grid1.DataSource = dt;             grid1.DataBind ();

--- button_click see report -

DsRF ds = new DsRF (); // DsRF is the name of the dataset             DataTable dt_RF = new DataTable ();             dt_RF.Columns.Add ("column1", typeof (string));            --- more columns ----

// Passing the grid data to the dataset (this is not right)

    for (int fila = 0; fila <grid1.Rows.Count - 1; fila++)
      {
        for (int col = 0; col < grid1.Rows[fila].Cells.Count; col++)
      {
            dt_RF.Rows.Add(grid1.Rows[fila].Cells[col].Text);

     }
    }

// show the dataset in the crystalview

        ReportDocument oRep = new ReportDocument();
        oRep.Load(Server.MapPath("~/Proyecto/myreporte.rpt"));
        oRep.SetDataSource(ds);
        CrystalReportViewer1.ReportSource = oRep;

I hope someone can help me

Thanks

Greetings