No valid report source is available- crystal reports

Question

I have created a report using crystal reports. I am using visual studio 2010. The problem occurs when I try to go to another page. When I try to navigate to page 2 or last page the error No valid report source is available appears on the screen. Does anyone have any idea what I need to do? Thanks for your time

Answer 1

Store you report in Session and then give report source from session on page post back

protected void Page_Load(object sender, EventArgs e)
{
       if (IsPostBack)
        {
            try
            {
                CrystalReportViewer1.ReportSource = (ReportDocument)Session["Report"];
                CrystalReportViewer1.RefreshReport();
                CrystalReportViewer1.DataBind();
            }
            catch (Exception ex)
            {

               // throw;
            } 
        }

    }
    protected void CrystalReportViewer1_PreRender(object sender, EventArgs e)
    {

    }
    protected void btnPrint_Click(object sender, EventArgs e)
    {
        ReportDocument rptDoc = new ReportDocument();
        rptDoc.Load(Server.MapPath("Reports\\BalanceReportNew\\BalanceReport.rpt"));
        rptDoc.SetDataSource(ReportData());
        Session["Report"] = rptDoc;
        CrystalReportViewer1.ReportSource = rptDoc;
        CrystalReportViewer1.RefreshReport();
        CrystalReportViewer1.DataBind();
    }
    public DataTable ReportData()
    {
        string ClassName = ddlClass.SelectedValue;
        string Division = ddlDivison.SelectedValue;
        string Subject = ddlSubjects.SelectedValue;
        DataTable ReportData = objRpt.getReportData(ClassName, Division, Subject);
        return ReportData;
    }