text: Q:
  
  C# System.ComponentModel.Win32Exception (0x80004005): Not enough storage is available to process this command
  
  After running my application (.Net 4.5, 64-bit, WPF) a long time (one to two weeks) I encounter the following app crash:
  Faulting application name: XY.exe, Version: 2.12.2.2, Time: 0x5bade142
  Faulting module name: KERNELBASE.dll, Version: 6.1.7601.24150, Time: 0x5b0cbc65
  Exception code: 0xe0434352
  Fault offset: 0x000000000001a06d
  Faulting process id: 0x8694
  Faulting application start time: 0x01d457228a130410
  Faulting application path: C:\Testsysteme\YY.exe
  Faulting module path: C:\Windows\system32\KERNELBASE.dll
  Report Id: dbfc630b-c61f-11e8-bc27-1866da0d15ef
  
  Application: XY.exe
  Frameworkversion: v4.0.30319
  Description: The process was terminated due to an unhandled exception
  Exception information: System.ComponentModel.Win32Exception
  at MS.Win32.UnsafeNativeMethods.RegisterClassEx(WNDCLASSEX_D)
  at MS.Win32.HwndWrapper..ctor(Int32, Int32, Int32, Int32, Int32, Int32, Int32, System.String, IntPtr, MS.Win32.HwndWrapperHook[])
  at System.Windows.Interop.HwndSource.Initialize(System.Windows.Interop.HwndSourceParameters)
  at System.Windows.Interop.HwndSource..ctor(System.Windows.Interop.HwndSourceParameters)
  at System.Windows.Controls.Primitives.Popup+PopupSecurityHelper.BuildWindow(Int32, Int32, System.Windows.Media.Visual, Boolean, System.Windows.Interop.HwndSourceHook, System.Windows.AutoResizedEventHandler)
  at System.Windows.Controls.Primitives.Popup.BuildWindow(System.Windows.Media.Visual)
  at System.Windows.Controls.Primitives.Popup.CreateWindow(Boolean)
  at System.Windows.Controls.Primitives.Popup.OnIsOpenChanged(System.Windows.DependencyObject, System.Windows.DependencyPropertyChangedEventArgs)
  at System.Windows.DependencyObject.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs)
  at System.Windows.FrameworkElement.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs)
  at System.Windows.DependencyObject.NotifyPropertyChange(System.Windows.DependencyPropertyChangedEventArgs)
  at System.Windows.DependencyObject.UpdateEffectiveValue(System.Windows.EntryIndex, System.Windows.DependencyProperty, System.Windows.PropertyMetadata, System.Windows.EffectiveValueEntry, System.Windows.EffectiveValueEntry ByRef, Boolean, Boolean, System.Windows.OperationType)
  at System.Windows.DependencyObject.SetValueCommon(System.Windows.DependencyProperty, System.Object, System.Windows.PropertyMetadata, Boolean, Boolean, System.Windows.OperationType, Boolean)
  at System.Windows.Data.BindingOperations.SetBinding(System.Windows.DependencyObject, System.Windows.DependencyProperty, System.Windows.Data.BindingBase)
  at System.Windows.Controls.Primitives.Popup.CreateRootPopup(System.Windows.Controls.Primitives.Popup, System.Windows.UIElement)
  at System.Windows.Controls.ToolTip.OnIsOpenChanged(System.Windows.DependencyObject, System.Windows.DependencyPropertyChangedEventArgs)
  at System.Windows.DependencyObject.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs)
  at System.Windows.FrameworkElement.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs)
  at System.Windows.DependencyObject.NotifyPropertyChange(System.Windows.DependencyPropertyChangedEventArgs)
  at System.Windows.DependencyObject.UpdateEffectiveValue(System.Windows.EntryIndex, System.Windows.DependencyProperty, System.Windows.PropertyMetadata, System.Windows.EffectiveValueEntry, System.Windows.EffectiveValueEntry ByRef, Boolean, Boolean, System.Windows.OperationType)
  at System.Windows.DependencyObject.SetValueCommon(System.Windows.DependencyProperty, System.Object, System.Windows.PropertyMetadata, Boolean, Boolean, System.Windows.OperationType, Boolean)
  at System.Windows.DependencyObject.SetValue(System.Windows.DependencyProperty, System.Object)
  at System.Windows.Controls.PopupControlService.RaiseToolTipOpeningEvent()
  at System.Windows.Threading.DispatcherTimer.FireTick(System.Object)
  at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
  at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
  at System.Windows.Threading.DispatcherOperation.InvokeImpl()
  at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
  at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
  at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
  at MS.Internal.CulturePreservingExecutionContext.Run(MS.Internal.CulturePreservingExecutionContext, System.Threading.ContextCallback, System.Object)
  at System.Windows.Threading.DispatcherOperation.Invoke()
  at System.Windows.Threading.Dispatcher.ProcessQueue()
  at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
  at MS.Win32.HwndWrapper.WndProc(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
  at MS.Win32.HwndSubclass.DispatcherCallbackOperation(System.Object)
  at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
  at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
  at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, System.Object, Int32)
  at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr)
  at MS.Win32.UnsafeNativeMethods.DispatchMessage(System.Windows.Interop.MSG ByRef)
  at System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame)
  at System.Windows.Application.RunDispatcher(System.Object)
  at System.Windows.Application.RunInternal(System.Windows.Window)
  at XY.App.Main()
  
  Logging of the unhandled exception additionally showed: 
  System.ComponentModel.Win32Exception (0x80004005): Not enough storage is available to process this command
  
  I already found a link with a basic description of the problem connect.microsoft.com on web.archive.org and I downloaded an ran the AtomMonitor from JordiCorbilla/atom-table-monitor
   (GitHub). Indeed I found an increasing number of RWM Atoms created by my application over time (approx 4000 after some days). This fits to the exception message. All strings look like the following:
  C1FE = HwndWrapper[XY.exe;;b68ce81a-d29f-414b-b63a-3b6979e33dd3]  --RWM
  
  From the exception message I see that a 'Popup' is causing a RegisterClassEx from within the OnIsOpenChanged method.
  However, opening and closing several popups in my application and monitoring the count of RWM atoms in parallel, I can't see any increase, that's why I can't find the exact source of the problem. Just after some time, when looking at the statistics again I can see that the count increased.
  So my questions are:
  
  Can a Popup be responsible for raising the count of RWM atoms? If yes, is this a bug? Why does it create a new Window and registers these atoms?
  Do I use the Popup in a wrong way? Do I have to close/dispose/release something?
  Is the Popup the problem at all?
  What is the 'normal' number of RWM atoms an application creates or should not exceed, because as far as I know they can't be deleted anymore.
  
  A:
  
  After some research, I found the following: It was not related to popups or any "real" windows. Besides that, closing a popup releases the entry from the atom table. 
  The cause is: We create WriteableBitmaps on different tasks for image processing. Always when a new thread is used for this task (creating a WPF control), a Dispatcher gets created which in turn creates a HwndWrapper. 
  These resources are not released, if the dispatcher is not shutdown manually. Now we use the workaround from the following links:
  GitHub: Win32Exception is thrown when WPF runs out of internal resources
  SO: Why does LongRunning task (TPL) with JpegBitmapDecoder run out of resources?
  Microsoft Connect: System.ComponentModel.Win32Exception (0x80004005): Not enough storage is available to process this command
  SO: Resource leak when creating freezable objects in a background thread
  
  