---
title: "How to: Determine Whether a Freezable Is Frozen"
ms.date: "03/30/2017"
dev_langs: 
  - "csharp"
  - "vb"
helpviewer_keywords: 
  - "Freezable objects [WPF], determining if frozen"
ms.assetid: 92e58baa-ee12-4a9e-ac3a-ca458807a8b2
---
# How to: Determine Whether a Freezable Is Frozen
This example shows how to determine whether a <xref:System.Windows.Freezable> object is frozen. If you try to modify a frozen <xref:System.Windows.Freezable> object, it throws an <xref:System.InvalidOperationException>. To avoid throwing this exception, use the <xref:System.Windows.Freezable.IsFrozen%2A> property of the <xref:System.Windows.Freezable> object to determine whether it is frozen.  
  
## Example  
 The following example freezes a <xref:System.Windows.Media.SolidColorBrush> and then tests it by using the <xref:System.Windows.Freezable.IsFrozen%2A> property to determine whether it is frozen.  
  
 [!code-csharp[freezablesample_procedural#CheckIsFrozenExample](~/samples/snippets/csharp/VS_Snippets_Wpf/freezablesample_procedural/CSharp/freezablesample.cs#checkisfrozenexample)]
 [!code-vb[freezablesample_procedural#CheckIsFrozenExample](~/samples/snippets/visualbasic/VS_Snippets_Wpf/freezablesample_procedural/visualbasic/freezablesample.vb#checkisfrozenexample)]  
  
 For more information about <xref:System.Windows.Freezable> objects, see the [Freezable Objects Overview](freezable-objects-overview.md).  
  
## See also

- <xref:System.Windows.Freezable>
- <xref:System.Windows.Freezable.IsFrozen%2A>
- [Freezable Objects Overview](freezable-objects-overview.md)
- [How-to Topics](base-elements-how-to-topics.md)