To add the DataForm control to the Visual Studio .NET toolbox, follow these simple steps:

1. In Design view, select the Web forms tab of the Visual Studio .NET toolbox.
2. Right-click anywhere in the tab and select Add/Remove Items.
3. Select the .NET Framework Components tab, and then click Browse.
4. Browse to the location of the DataForm control assembly(EasyDotNet.Web.dll), select it, and click Open. There is a copy at "Program Files\EasyDotNet\bin"
5. Click OK.