C# :: Return Message When Fail To Open Database

I dont know how return message when user fail to open Database.

I building this class to manage db

The "open" method return an OleDbConnection type to manage it later

On catch zone I cant return string , int or other types

class ApriDB {
//Stato interno
string connessione = "";
// metodi
public ApriDB() { } // Costruttore di default
public OleDbConnection open (string connessione) {
OleDbConnection conn = new OleDbConnection(connessione);

[code].....