How to update a document displayed by the ASPxDocumentViewer within the ASPxPopupControl

Question Comments

This example not working

Hello Nasser,

I have just tried to run this example online (here is a direct link) and download a sample project to my machine. In both cases, the sample project from this Code Example operates correctly. It would be great if you register a new ticket in our Support Center and describe what error you are facing with the sample project from this Code Example.

Thanks,
Dmitry

It is better to assign the report in the ASPxDocumentViewer's OnLoad event. And it is only necessary to do it upon a callback or a postback. Callbacks occur when the ASPxDocumentViewer is shown, and postbacks occur when a button on the ASPxDocumentViewer's toolbar is clicked. This has the advantage, that when the page contains other controls that produce callbacks like grids, the report is not created, saving processing time. I also found out, that there is no need to call this.DocumentViewer1.DataBind(), it does not seem to make any difference. Therefore, Default.aspx.cs can be written as follows:

using System;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{
   protected void DocumentViewer1_Load(object sender, EventArgs e)
   {
       if (IsCallback || IsPostBack)
       {
           var hf = (HtmlInputHidden)this.Page.FindControl("ReportMsg");
           var report = new XtraReport1();
           report.Parameters["test"].Value = hf.Value.ToString();
           report.CreateDocument();
           this.DocumentViewer1.Report = report;
       }
   }
}

The OnLoad event must be added to DocumentViewer1:
                   <dxxr:ASPxDocumentViewer ID="DocumentViewer1" runat="server" ClientInstanceName="DocumentViewer"
                       ShowLoadingPanelImage="False" LoadingPanelText="" OnLoad="DocumentViewer1_Load">
                       <SettingsSplitter SidePaneVisible="False" />
                   </dxxr:ASPxDocumentViewer>