"Linda Liu [MSFT]" wrote:

> Hi Juan,
>
> Thank you for posting.
>
> Do you mean that you couldn't open the form that has some user controls on
> it in the designer?
>
> When a form with a user control on it is displayed in the designer, VS IDE
> will call the code in the user control's constructor and event handler for
> the user control's Load event.
>
> So you shouldn't place any code regarding connecting database or any
> operation on the database in the user control's constructor and event
> handler for the user control's Load event.
>
> Besides, if there's only one constructor in the user control class, the
> constructor shouldn't take any parameter. If you need pass parameters in
> the constructor, you could add a constructor which has no parameter.
>
> Hope this helps.
> Please try my suggestions and let me know the result.
>
>
> Sincerely,
> Linda Liu
> Microsoft Online Community Support
>
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