crystal report problem RSS

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  arunkmohan18

  Member

  30 Points

  158 Posts

  crystal report problem

  Aug 18, 2012 02:06 PM|LINK

  this is the code to show report

  here my problem is whenever postback happens the reportdocument r gets null and report disappears so i need to store reportdcument value to session

  and call on every postbacknow i want to remove this session i use dataset to get values

  public partial class register : System.Web.UI.Page
  {
      Class1 obj = new Class1(); //i use class file to getvalues
      string sql = "";
      Label l1;
      DataTable dt = new DataTable();
      CrystalDecisions.CrystalReports.Engine.ReportDocument r = new CrystalDecisions.CrystalReports.Engine.ReportDocument();
  
      protected void Page_init(object sender, EventArgs e)
      {
          if (IsPostBack == false)
          {
              CrystalReportViewer1.ReportSource = null;
              CrystalReportViewer1.DataBind();
              Session["reportpatientregistration"] = null;
          }
          crystal();
      }
      public void crystal()
      {
          if (Session["reportpatientregistration"] != null)
          {
              r = (ReportDocument)Session["reportpatientregistration"];
              CrystalReportViewer1.ReportSource = r;
             
          }
      }
      protected void ImageButton2_Click(object sender, ImageClickEventArgs e)
      {
          sql = "select query from table -----";
          dt = obj.GetRecord(sql);  // here query executes and set the value to datatable dt
          r.Load(MapPath("~/CrystalReports/register.rpt"));
          r.SetDataSource(dt);
          CrystalReportViewer1.ReportSource = r;
          CrystalReportViewer1.DataBind();
          Session["reportpatientregistration"] = r;
      }
  }

   

  • Edited by arunkmohan18 on Aug 18, 2012 02:09 PM
  • Moved by MetalAsp.Net on Aug 19, 2012 10:46 AM
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  Ramesh Chand...

  Star

  12922 Points

  2672 Posts

  Re: crystal report problem

  Aug 18, 2012 03:06 PM|LINK

  arunkmohan18

  here my problem is whenever postback happens the reportdocument r gets null and report disappears so i need to store reportdcument value to session

  and call on every postbacknow i want to remove this session i use dataset to get values

  So, finally what problem you are facing ?

  If this post answered your question or solved your problem, please Mark it as Answer.
• • Reply
  

  arunkmohan18

  Member

  30 Points

  158 Posts

  Re: crystal report problem

  Aug 18, 2012 03:16 PM|LINK

  Ramesh Chandra

  arunkmohan18

  here my problem is whenever postback happens the reportdocument r gets null and report disappears so i need to store reportdcument value to session

  and call on every postbacknow i want to remove this session i use dataset to get values

  So, finally what problem you are facing ?

  i want to remove this session and how to stop null report on postback

• • Reply
  

  Ramesh Chand...

  Star

  12922 Points

  2672 Posts

  Re: crystal report problem

  Aug 19, 2012 09:38 AM|LINK

  arunkmohan18

  i want to remove this session and how to stop null report on postback

  if you want to show report even in postback, you have to use the session.

  If this post answered your question or solved your problem, please Mark it as Answer.
  • Marked as answer by haixia xie - msft on Sep 10, 2012 12:03 PM
• • Reply
  

  Ajay2707

  Contributor

  4421 Points

  856 Posts

  Re: crystal report problem

  Aug 21, 2012 05:06 AM|LINK

  Hi Arunkmohan,

  As Harsh said, this is standarad process to follow while postback. Read this article with same problem.

  http://dotnetslackers.com/Community/forums/crystalreportviewer-disappears-after-postback/p/964/7314.aspx

  http://social.msdn.microsoft.com/Forums/en-US/vscrystalreports/thread/2c4dcc6c-d17b-40b2-bf1d-96ffde5bd333

  http://www.dotnetspider.com/forum/163725-crystal-report-viewer-disappearing.aspx

  Please, Mark as Answer if this reply helped you.