---
title: "How to: Open a Window"
ms.date: "03/30/2017"
dev_langs: 
  - "csharp"
  - "vb"
helpviewer_keywords: 
  - "windows [WPF], opening"
  - "opening windows [WPF]"
ms.assetid: 6b91b2bb-fda7-491d-a72e-139dd630a5b0
---
# How to: Open a Window
This example shows how to open a window.  
  
## Example  
 A window is opened by instantiating <xref:System.Windows.Window> and calling the <xref:System.Windows.Window.Show%2A> method. <xref:System.Windows.Window.Show%2A> opens a window and returns immediately without waiting for the new window to close. This type of window is also known as a *modeless* window, and doesn't restrict user input.  
  
 [!code-csharp[HOWTOWindowManagementSnippets#OpenNewWindowCODE](~/samples/snippets/csharp/VS_Snippets_Wpf/HOWTOWindowManagementSnippets/CSharp/MainWindow.xaml.cs#opennewwindowcode)]
 [!code-vb[HOWTOWindowManagementSnippets#OpenNewWindowCODE](~/samples/snippets/visualbasic/VS_Snippets_Wpf/HOWTOWindowManagementSnippets/visualbasic/mainwindow.xaml.vb#opennewwindowcode)]  
  
## .NET Framework Security  
 Instantiating <xref:System.Windows.Window> requires permission to call unsafe native methods (see <xref:System.Windows.Window.%23ctor%2A>).