Interesting bug causes an infinite loop when report is rendered

[Joseph]

Hi Guys (and girls),

I have a super interesting bug.

I'm using the AJAX Telerik Report viewer inside an MVC project.

The parameters of the report are actually set programatically.
I have an AJAX.Form that lets the user set some parameters. This will draw a report by overriding the parameters like so:

Protected Overrides Sub OnLoad(ByVal e As System.EventArgs)
    MyBase.OnLoad(e)
    'Bind the report viewer
    If Model.Report Is Nothing Then
        Throw New Exception("Sorry an error has occured. (The report must be intialized before render attempt)")
    End If

    If Model.ReportParameters Is Nothing Then
        Model.ReportParameters = New Telerik.Reporting.ReportParameterCollection()
    End If

    For Each existingParam In Model.ReportParameters
        Model.Report.ReportParameters.Add(existingParam)
    Next

    modularRptViewer.ParametersAreaVisible() = False
    modularRptViewer.Report = Model.Report

End Sub

It never finishes rendering. it just sits there on "Generating report"

The report it is binding using a sql dataSource.  I've put a trace on the sql server and i can see it endlessly hitting the stored procedure the datasource uses. (It also endlessly calls [sp_procedure_params_100_managed] passing_in_the_SP_name)

any idea what is going on?
Could it be caused by having a table sitting in the details section (this always makes me feel weird).

Regards,

[Peter]

Hello Joseph,

Our suspicion is that the infinite loop could be because of the AJAX thus our suggestion is to turn it off. If this is not the cause you can try to pause the application execution to debug it.

Let us know how it goes and if you need additional assistance we will appreciate if you prepare and send us a sample runnable project to debug locally.

All the best,
Peter
the Telerik team

[Joseph]

Hi Support,

I found the cause, sort of. 
I moved the grid to the report header. Now it only calls the sp once.
Problem solved. Mystery remains.

Regards,