Repeater ItemCommand Throws Error When Executed Within Update Panel

I have a repeater whose ItemCommand successfully fires when it is not contained within an Update Panel. However, if I place the Repeater within an Update Panel, it does not fire and causes some sort of AJAX error. Any ideas on where to start?

Line: 939

Char: 13

Error: Sys.WebForms.PageRequestManagerParserErrorException. The message received from the server could not be parsed.

Re: Repeater ItemCommand Throws Error When Executed Within Update Panel

Have you placed ScriptManager before the update panel?
Are you using Response Method in your code Like Response.Redirect etc.

Re: Repeater ItemCommand Throws Error When Executed Within Update Panel

anuj_koundal

Have you placed ScriptManager before the update panel. If yes post your source.

Yes, its on the master page. The Repeater is actually on a User Control. The ItemCommand did successfully fire w/out throwing any errors up until I made some changes to the control, however the changes did not impact LinkButton that fires the event.

Re: Repeater ItemCommand Throws Error When Executed Within Update Panel

See these post They May help.

http://forums.asp.net/t/1392827.aspx

http://stackoverflow.com/questions/1554728/the-message-received-from-the-server-could-not-be-parsed-common-causes-for-this

http://weblogs.asp.net/leftslipper/archive/2007/02/26/sys-webforms-pagerequestmanagerparsererrorexception-what-it-is-and-how-to-avoid-it.aspx

Re: Repeater ItemCommand Throws Error When Executed Within Update Panel

I've narrowed the most likely cause of the problem to the actual code that fires in the event. It creates a vCal file in memory and streams it to the client. The odd part of it is that it worked up until I made some unrelated changes to the user control in which the Repater sits. I'll probably just hack it and make the ItemCommand open a page that handles creating the vCal stand alone.

Protected Sub RepeaterShowGateway_ItemCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.RepeaterCommandEventArgs) Handles RepeaterShowGateway.ItemCommand

        Select Case e.CommandName
            Case "CreateCalendarItem"
                Exit Sub
                'http://www.codeproject.com/KB/aspnet/vcalendarfiletodownload.aspx
                'PARAMETERS
                Dim LabelNameLong As Label = CType(e.Item.FindControl("LabelNameLong"), Label)
                Dim LabelBranchNameShort As Label = CType(e.Item.FindControl("LabelBranchNameShort"), Label)
                Dim LabelShowNumber As Label = CType(e.Item.FindControl("LabelShowNumber"), Label)

                Dim vcal_LabelTFCMoveIn As Label = CType(e.Item.FindControl("vcal_LabelTFCMoveIn"), Label)
                Dim beginDate As Date = vcal_LabelTFCMoveIn.Text

                Dim vcal_LabelTFCClear As Label = CType(e.Item.FindControl("vcal_LabelTFCClear"), Label)
                Dim endDate As Date = vcal_LabelTFCClear.Text

                'INITIALIZATION

                Dim mStream As New MemoryStream()
                Dim writer As New StreamWriter(mStream)
                writer.AutoFlush = True
                'HEADER

                writer.WriteLine("BEGIN:VCALENDAR")
                writer.WriteLine("PRODID:-//Flo Inc.//FloSoft//EN")
                writer.WriteLine("BEGIN:VEVENT")
                'BODY

                writer.WriteLine("DTSTART;VALUE=DATE:" & _
                         beginDate.ToUniversalTime.ToString("yyyyMMdd"))
                writer.WriteLine("DTEND;VALUE=DATE:" & _
                        endDate.ToUniversalTime.ToString("yyyyMMdd"))
                writer.WriteLine("LOCATION:")
                'Add Links here to Booking Report, QF, Sharepoint Folder and Show Site Dashboard
                writer.WriteLine("DESCRIPTION:" & "Message Body Here")
                writer.WriteLine("SUMMARY:" & LabelNameLong.Text & " " & "(" & LabelBranchNameShort.Text & "-" & LabelShowNumber.Text & ")")
                'FOOTER

                writer.WriteLine("PRIORITY:3")
                writer.WriteLine("END:VEVENT")
                writer.WriteLine("END:VCALENDAR")
                'MAKE IT DOWNLOADABLE

                Response.Clear() 'clears the current output content from the buffer

                Response.AppendHeader("Content-Disposition", _
                         "attachment; filename=OutlookAppointment.vcs")
                Response.AppendHeader("Content-Length", mStream.Length.ToString())
                Response.ContentType = "application/download"
                Response.BinaryWrite(mStream.ToArray())
                Response.End()
            Case Else
        End Select

    End Sub

Re: Repeater ItemCommand Throws Error When Executed Within Update Panel

Post Your .aspx code.

If you are trying to open a new page using repeaters item command, make trigger of the item command.

Re: Repeater ItemCommand Throws Error When Executed Within Update Panel

For whatever reason, AJAX wasn't liking having the code that I posted execute when the _ItemCommand was being fired. I ended up abandoning the _ItemCommand event and simply went with JavaScript that opens a page which then executes the code. Technically this didn't solve the probelm, but it eliminated it by providing a viable workaround which actually creates a much more solid design as the code can now be executed from any point within the application.

I have marked this thread as resovled, but without an answer as the root issue (executing the code posting with an AJAX UpdatePanel) was never actually resolved.