How can custom controls be integrated into a Visual Studio project?

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Custom controls can be integrated into a Visual Studio project by following these steps:

1. Build the custom control project or acquire the compiled DLL
2. Open the project where you want to use the custom control
3. From the Toolbox, right-click and select "Choose Items..."
4. In the "Choose Toolbox Items" dialog, click the "Browse" button and navigate to the location of the custom control DLL
5. Select the DLL and click "Open"
6. The custom control should now appear in the Toolbox, and can be dragged onto a form or designer surface

Note: Some custom controls may require additional setup or configuration, depending on their functionality and implementation. It is recommended to consult the documentation or support resources for the custom control to ensure that it is implemented correctly.