---
title: "How to: Erase Ink on a Custom Control"
ms.date: "03/30/2017"
dev_langs: 
  - "csharp"
  - "vb"
helpviewer_keywords: 
  - "custom controls [WPF], erasing ink on"
  - "ink [WPF], erasing on custom control"
ms.assetid: d88c50f9-b4d8-4962-a28b-67d6a15a5fe0
---
# How to: Erase Ink on a Custom Control
The <xref:System.Windows.Ink.IncrementalStrokeHitTester> determines whether the currently drawn stroke intersects another stroke.  This is useful for creating a control that enables a user to erase parts of a stroke, the way a user can on an <xref:System.Windows.Controls.InkCanvas> when the <xref:System.Windows.Controls.InkCanvas.EditingMode%2A> is set to <xref:System.Windows.Controls.InkCanvasEditingMode.EraseByPoint>.  
  
## Example  
 The following example creates a custom control that enables the user to erase parts of strokes.  This example creates a control that contains ink when it is initialized.  To create a control that collects ink, see [Creating an Ink Input Control](creating-an-ink-input-control.md).  
  
 [!code-csharp[HowToEraseInk#1](~/samples/snippets/csharp/VS_Snippets_Wpf/HowToEraseInk/CSharp/InkEraser.cs#1)]
 [!code-vb[HowToEraseInk#1](~/samples/snippets/visualbasic/VS_Snippets_Wpf/HowToEraseInk/VisualBasic/InkEraser.vb#1)]