docs-desktop/dotnet-desktop-guide/framework/winforms/controls/how-to-inherit-from-the-control-class.md

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How to: Inherit from the Control Class	03/30/2017	inheritance [Windows Forms], Windows Forms custom controls Control class [Windows Forms], inheriting from custom controls [Windows Forms], inheritance OnPaint method [Windows Forms] custom controls [Windows Forms], creating	46ba0df3-5cf7-443c-a3b4-a72660172476	jillre	jillfra	jillfra

How to: Inherit from the Control Class

If you want to create a completely custom control to use on a Windows Form, you should inherit from the xref:System.Windows.Forms.Control class. While inheriting from the xref:System.Windows.Forms.Control class requires that you perform more planning and implementation, it also provides you with the largest range of options. When inheriting from xref:System.Windows.Forms.Control, you inherit the very basic functionality that makes controls work. The functionality inherent in the xref:System.Windows.Forms.Control class handles user input through the keyboard and mouse, defines the bounds and size of the control, provides a windows handle, and provides message handling and security. It does not incorporate any painting, which in this case is the actual rendering of the graphical interface of the control, nor does it incorporate any specific user interaction functionality. You must provide all of these aspects through custom code.

To create a custom control

1. In Visual Studio, create a new Windows Application or Windows Control Library project.

2. From the Project menu, choose Add Class.

3. In the Add New Item dialog box, click Custom Control.

   A new custom control is added to your project.

4. Press F7 to open the Code Editor for your custom control.

5. Locate the xref:System.Windows.Forms.Control.OnPaint%2A method, which will be empty except for a call to the xref:System.Windows.Forms.Control.OnPaint%2A method of the base class.

6. Modify the code to incorporate any custom painting you want for your control.

   For information about writing code to render graphics for controls, see Custom Control Painting and Rendering.

7. Implement any custom methods, properties, or events that your control will incorporate.

8. Save and test your control.

See also

• Varieties of Custom Controls
• How to: Inherit from the UserControl Class
• How to: Inherit from Existing Windows Forms Controls
• How to: Author Controls for Windows Forms
• Troubleshooting Inherited Event Handlers in Visual Basic
• Developing Windows Forms Controls at Design Time