docs-desktop/dotnet-desktop-guide/framework/winforms/controls/how-to-implement-a-form-that-uses-a-background-operation.md

title, description, ms.date, dev_langs, helpviewer_keywords, ms.assetid

title	description	ms.date	dev_langs	helpviewer_keywords	ms.assetid
How to: Implement a Form That Uses a Background Operation	Learn how to implement a Windows Form that uses a background operation so that one operation can continue to run while another operation proceeds.	03/30/2017	csharp vb cpp	threading [Windows Forms], forms BackgroundWorker component background tasks forms [Windows Forms], multithreading components [Windows Forms], asynchronous forms [Windows Forms], background operations background threads threading [Windows Forms], background operations background operations	9f483f93-1613-4be1-a021-b4934e9c78f3

How to: Implement a Form That Uses a Background Operation

The following example program creates a form that calculates Fibonacci numbers. The calculation runs on a thread that is separate from the user interface thread, so the user interface continues to run without delays as the calculation proceeds.

There is extensive support for this task in Visual Studio.

Also see Walkthrough: Implementing a Form That Uses a Background Operation.

Example

[!code-cppSystem.ComponentModel.BackgroundWorker#1] [!code-csharpSystem.ComponentModel.BackgroundWorker#1] [!code-vbSystem.ComponentModel.BackgroundWorker#1]

Compiling the Code

This example requires:

• References to the System, System.Drawing, and System.Windows.Forms assemblies.

Robust Programming

Caution

When using multithreading of any sort, you potentially expose yourself to very serious and complex bugs. Consult the Managed Threading Best Practices before implementing any solution that uses multithreading.

See also

• xref:System.ComponentModel.BackgroundWorker
• xref:System.ComponentModel.DoWorkEventArgs
• Event-based Asynchronous Pattern Overview
• Managed Threading Best Practices