crystal report viewer next page not working - asp.net

Question

I am using visual studio 2010 and crystal report 13.0
The report viewer displays the first page properly. But the next page button is not working. If i click on next page button then it shows loading message and stays there only.None of the report viewer controls are working.
please help me out

Answer 1

I found the solution.
Manually add the Page_Init() event and wire it up in the InitializeCompnent() with
this.Init += new System.EventHandler(this.Page_Init).
Move the contents of Page_Load to Page_Init().
Add if (!IsPostBack) condition in PageInIt.
protected void Page_Init(object sender, EventArgs e)
{
if (!IsPostBack)
{
ReportDocument crystalReportDocument = new ReportDocumment();
crystalReportDocument.SetDataSource(DataTableHere);
_reportViewer.ReportSource = crystalReportDocument;
Session["ReportDocument"] = crystalReportDocument;
}
else
{
ReportDocument doc = (ReportDocument)Session["ReportDocument"];
_reportViewer.ReportSource = doc;
}
}

Answer 2

Instead of manually identifying the moment to bind, you could use the CrystalReportViewer AutoDataBind property in combination with the DataBinding event.
Autobind definition:
// Summary:
// Boolean. Gets or sets whether automatic data binding to a report source is
// used. If the value is set to True, the DataBind() method is called after
// OnInit() or Page_Init().
[Category("Data")]
[DefaultValue(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
public bool AutoDataBind { get; set; }
You could use this property in the following manner:
In the ASPX:
<CR:CrystalReportViewer ID="_reportViewer" runat="server" AutoDataBind="true" OnDataBinding="_reportViewer_DataBinding" />
And in the ASPX.CS:
protected void _reportViewer_DataBinding(object sender, EventArgs e)
{
if (!IsPostBack)
{
ReportDocument crystalReportDocument = new ReportDocumment();
crystalReportDocument.SetDataSource(DataTableHere);
_reportViewer.ReportSource = crystalReportDocument;
Session["ReportDocument"] = crystalReportDocument;
}
else
{
ReportDocument doc = (ReportDocument)Session["ReportDocument"];
_reportViewer.ReportSource = doc;
}
}

Answer 3

Done! Shift your Page load Event to Page Init Event.

Answer 4

protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
int pageIndex =((CrystalDecisions.Shared.PageRequestContext)
CrystalReportViewer1.RequestContext).PageNumber;
//Bind Report with filter and datasource
string ControID = GetPostBackControlName(this);
//get and check Crystal Report Navigation button event after Bind Report
if (ControID == null)
{
((CrystalDecisions.Shared.PageRequestContext)
CrystalReportViewer1.RequestContext).PageNumber = pageIndex;
}
}
}
public string GetPostBackControlName(Page Page)
{
Control control = null;
string ctrlname = Page.Request.Params["__EVENTTARGET"];
if (ctrlname != null && ctrlname != String.Empty)
{
control = Page.FindControl(ctrlname);
}
else
{
string ctrlStr = String.Empty;
Control c = null;
foreach (string ctl in Page.Request.Form)
{
if (ctl.EndsWith(".x") || ctl.EndsWith(".y"))
{
ctrlStr = ctl.Substring(0, ctl.Length - 2);
c = Page.FindControl(ctrlStr);
}
else
{
c = Page.FindControl(ctl);
}
if (c is System.Web.UI.WebControls.Button ||
c is System.Web.UI.WebControls.ImageButton)
{
control = c;
break;
}
}
}
if (control == null)
{
return null;
}
else
{
return control.ID;
}
}