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Trying to make a connection on a WinForm gives this error:

Failed to create an instance of 'CoreLab.MyDac.TMyConnection' because 'System.MissingMethodException: Constructor voor type CoreLab.MyDac.TMyConnection is niet gevonden.
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at Borland.Studio.Host.CreationManager.a(Type , Object[] , Type[] , Boolean )'.

Have you tried WinForms demo (c:\Program Files\CoreLab\MyDac for Delphi 2006\Demos\dotNet\WinForms\)?