No se puede llamar a AddNew en el tipo '<var>X</var>'. Este tipo no tiene un constructor público predeterminado. Puede llamar a AddNew en el tipo '<var>X</var>' si establece AllowNew=true y controla el evento AddingNew.

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AddNew cannot be called on the '<var>X</var>' type. This type does not have a public default constructor. You can call AddNew on the '<var>X</var>' type if you set AllowNew=true and handle the AddingNew event.

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