How can I get useful WPF .NET error information from a user's machine?

Question

I have a WPF application that\'s crashing once I get it onto machines that do not have a development environment installed-- if this is a dupe, I\'m welcome to closing, but

Answer 1

In addition to Alistair's answer, it's the InnerException that gave me the clues I was looking for:

public partial class App : Application {
    void App_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e) {
        Exception ex = e.Exception;
        Exception ex_inner = ex.InnerException;
        string msg = ex.Message + "\n\n" + ex.StackTrace + "\n\n" +
            "Inner Exception:\n" + ex_inner.Message + "\n\n" + ex_inner.StackTrace + "\n\n" + 
            Utils.RegistryVersion();
        MessageBox.Show(msg, "Drop Print Batch Application Halted!", MessageBoxButton.OK);
        Utils.MailReport(msg);
        e.Handled = true;
        Application.Current.Shutdown();
    }
}