I've found the error on the

<AppSettings>

keyword in the config file. Apparently it should be

<appSettings>

makes sense since xml is case sensitive.

Thanks again for your reply,

Enmanuel


>
>This works ok for me. I added the Aplicacion key in my app.config file and did this:
>
>

>        Dim sAppName As String = System.Configuration.ConfigurationSettings.AppSettings("Aplicacion")
>        MessageBox.Show(sAppName)
>

>
>The name of the key was displayed ok.