This is because the MessageDialog widget uses pango markup by default (https://developer.gnome.org/pango/stable/PangoMarkupFormat.html) so in your example the "&" is used for special characters and try to parse it.

So if you not wan't use pango markup create the messagedialog with this contructor.

var md = new MessageDialog(null, DialogFlags.Modal, MessageType.Info, ButtonsType.Ok, false, msg);

Regards

Jesus Eguiluz
Ingeniero Electrónico.
Investigación y Desarrollo
Andes Electrónica Ltda.
www.andeselec.com

El 28/04/15 a las 08:28, Edward Ned Harvey (mono) escibió:
string msg = "Hello & there";
        var md = new MessageDialog(null, DialogFlags.Modal, MessageType.Info, 
ButtonsType.Ok, msg);
        md.Run();
        md.Destroy();

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