The handle is invalid

[John Snyder]

We get this error on occasion in our application and was wondering what may be causing it.  Any help/guidance would be appreciated.

System.IO.IOException: The handle is invalid.

at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.__Error.WinIOError()
at System.Threading.EventWaitHandle.Set()
at Telerik.Web.UI.RadScheduler.resourceTypeControl_DataBound(Object sender, EventArgs e)
at System.Web.UI.WebControls.BaseDataBoundControl.OnDataBound(EventArgs e)
at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data)
at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback)
at System.Web.UI.WebControls.DataBoundControl.PerformSelect()
at System.Web.UI.WebControls.BaseDataBoundControl.DataBind()
at Telerik.Web.UI.RadScheduler.BindResourcesFromDataSource()
at Telerik.Web.UI.RadScheduler.PerformSelect()
at System.Web.UI.WebControls.BaseDataBoundControl.DataBind()
at Telerik.Web.UI.RadScheduler.EnsureDataBound()
at Telerik.Web.UI.RadScheduler.CreateChildControls(Boolean bindFromDataSource)
at Telerik.Web.UI.RadScheduler.CreateChildControls()
at System.Web.UI.Control.EnsureChildControls()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

[Veronica]

Hi Dustin DeFoe,

Unfortunately the provided information is not enough for us to tell you what may cause this error. I suspect that there is a problem in the binding of resources but I will need some more assistance from your side. Could you please show me the code of the RadScheduler and how do you bind it?

Thank you!

Kind regards,
Veronica Milcheva
the Telerik team

[John Snyder]

HTML Code:

<telerik:RadAjaxManagerProxy ID="AjaxManagerProxy1" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="RadScheduler1">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="RadScheduler1" LoadingPanelID="RadAjaxLoadingPanel1" />
            </UpdatedControls>
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManagerProxy>
<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Skin="Default" />

    <telerik:RadScheduler runat="server" ID="RadScheduler1"
        Height="95%" Width="100%"
        ShowFooter="false"
        AllowEdit="false" AllowInsert="false" AllowDelete="false"
        ReadOnly="true" Enabled="true"
        DayStartTime="08:00:00" DayEndTime="17:00:00"
        FirstDayOfWeek="Monday" LastDayOfWeek="Friday"
        EnableDescriptionField="false"
        DataKeyField="ID"
        DataSubjectField="Subject"
        DataStartField="Start"
        DataEndField="End"
        DataRecurrenceField="RecurrenceRule"
        DataRecurrenceParentKeyField="RecurrenceParentID"
        NumberOfHoveredRows="1"
        MonthView-VisibleAppointmentsPerDay="8"
        TimelineView-UserSelectable="False"
        DayView-UserSelectable="True"
        MonthView-UserSelectable="True"
        WeekView-UserSelectable="True"
        AppointmentContextMenuSettings-EnableDefault="false"
        TimeSlotContextMenuSettings-EnableDefault="false">
        <ResourceStyles>
            <telerik:ResourceStyleMapping Type="TimeCode" Text="Hearing Slot" ApplyCssClass="rsCategoryGreen" />
            <telerik:ResourceStyleMapping Type="TimeCode" Text="Credit" ApplyCssClass="rsCategoryGreen" />
            <telerik:ResourceStyleMapping Type="TimeCode" Text="Emergent Hearing Slot" ApplyCssClass="rsCategoryRed" />
            <telerik:ResourceStyleMapping Type="TimeCode" Text="Vacation" ApplyCssClass="rsCategoryBlue" />
            <telerik:ResourceStyleMapping Type="TimeCode" Text="Training" ApplyCssClass="rsCategoryPink" />
            <telerik:ResourceStyleMapping Type="TimeCode" Text="Holiday - Office Open" ApplyCssClass="rsCategoryOrange" />
            <telerik:ResourceStyleMapping Type="TimeCode" Text="Holiday - Office Closed" ApplyCssClass="rsCategoryOrange" />
            <Telerik:ResourceStyleMapping Type="TimeCode" Text="" ApplyCssClass="rsCategoryOrange" />
            <telerik:ResourceStyleMapping Type="TimeCode" Text="Settlement" ApplyCssClass="rsCategoryYellow" />
        </ResourceStyles>
        <AppointmentTemplate>
            <div>
                <asp:hyperlink ID="hlSubject" runat="server" Text='<%# Eval("Subject") %>' />
            </div>
        </AppointmentTemplate>
    </telerik:RadScheduler>

Binding (We are binding to a list of our Custom Object - CalendarEvent)

RadScheduler1.DataSource = GetAppointmentsForView()

AppointmentDataBound

Protected Sub RadScheduler1_AppointmentDataBound(ByVal sender As Object, ByVal e As Telerik.Web.UI.SchedulerEventArgs) Handles RadScheduler1.AppointmentDataBound
    Dim evnt As CalendarEvent = CType(e.Appointment.DataItem, CalendarEvent)
    Dim Subject As String = String.Empty
    Dim Tooltip As String = String.Empty
    Dim HREF As String = String.Empty
    Dim ShortSubject As String = String.Empty
    GetSubject(evnt, Subject, Tooltip, ShortSubject)

    e.Appointment.Subject = Subject
    e.Appointment.ToolTip = Tooltip
End Sub

PreRender

Protected Sub RadScheduler1_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles RadScheduler1.PreRender
    Dim PopupCal As RadCalendar = RadScheduler1.FindControl("SelectedDateCalendar")
    PopupCal.FastNavigationStep = 12
End Sub

[Veronica]

Hi Dustin DeFoe,

I tried to reproduce the issue but to no avail. There is no error on my side. The only thing that is different on my side is the way I bind the RadScheduler - in my case it is with XmlProvider. Could you please take a look at the attached .zip  file and test whether the issue appears on your side?

All the best,
Veronica Milcheva
the Telerik team

[JJ]

Hi

I think this was used:
 private static EventWaitHandle asyncWait = new ManualResetEvent(false);

then

asyncWait.Set(); //inside a wrong event

because that is what I am trying to do in my preRenderEvent to wait until the event is finished... then do a task..

[Boyan Dimitrov]

Hello JJ,

Could you please elaborate a bit more on your scenario and explain what  issue you are facing?

Regards,
Boyan Dimitrov
Telerik