I am getting a very strange error that I cannot resolve:
Message: Unhandled Error in Silverlight Application Object reference not set to an instance of an object. at Telerik.Windows.Controls.RadBook.OnCurrentSheetIndexChanged(Int32 newValue, Int32 oldValue)
at Telerik.Windows.Controls.RadBook.OnRightPageIndexChanged(Int32 rightPageIndex)
at Telerik.Windows.Controls.RadBook.OnRightPageIndexPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
at Telerik.Windows.PropertyMetadata.<>c__DisplayClass1.<Create>b__0(DependencyObject d, DependencyPropertyChangedEventArgs e)
at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue)
at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet)
at Telerik.Windows.Controls.RadBook.set_RightPageIndex(Int32 value)
at HotmailBackToSchool.MainPage.OpenTipPage1(Object sender, RoutedEventArgs e)
at System.Windows.Controls.Primitives.ButtonBase.OnClick()
at System.Windows.Controls.Button.OnClick()
at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)
My code is pretty basic. I cannot find anything wrong in here:
private
void OpenPage1(object sender, System.Windows.RoutedEventArgs e)
{
this.Book.RightPageIndex = 1;
}
It happens while the app in
RightPageIndex = 11, RightPageIndex = 9, or RightPageIndex = 7 and I cleck a button to open forst page.
I tried suggested fix from other post:
this
.Dispatcher.BeginInvoke(new Action(() => { Book.RightPageIndex = 1; }));
It does not solve this issue. I am wondering if it is possible to fix. Please help. Thank you in advance!