How to override a virtual method that has an out parameter?

c#,function,virtual-method,out-parameter

No, you don't need to set pMensajeError = ??;, at least not at the line where you put it. pMensajeError is already set by the call to base.AgregarEtapa. You can re-assign if you actually want to give it a different value, but if you want to use the value set...