How can I get notification when a mirrored SQL Server database has failed over

using System;
using System.Data.SqlClient;

namespace FailoverMonitorConcept
{
    class Program
    {
        static void Main(string[] args)
        {
            string server = args[0];
            string failover = args[1];
            string database = args[2];

            string connStr = string.Format("Integrated Security=SSPI;Persist Security Info=True;Data Source={0};Failover Partner={1};Packet Size=4096;Initial Catalog={2}", server, failover, database);
            string sql = "EXEC sp_helpserver";

            SqlConnection dc = new SqlConnection(connStr);
            SqlCommand cmd = new SqlCommand(sql, dc);
            Console.WriteLine("Connection string: " + connStr);
            Console.WriteLine("Press any key to test, press q to quit");

            string priorServerName = "";
            char key = ' ';

            while(key.ToString().ToLower() != "q")
            {
                dc.Open();
                try
                {
                    string serverName = cmd.ExecuteScalar() as string;
                    Console.WriteLine(DateTime.Now.ToLongTimeString() + " - Server name: " + serverName);
                    if (priorServerName == "")
                    {
                        priorServerName = serverName;
                    }
                    else if (priorServerName != serverName)
                    {
                        Console.WriteLine("***** SERVER CHANGED *****");
                        Console.WriteLine("New server: " + serverName);
                        priorServerName = serverName;
                    }
                }
                catch (System.Data.SqlClient.SqlException ex)
                {
                    Console.WriteLine("Error: " + ex.ToString());
                }
                finally
                {
                    dc.Close();
                }
                key = Console.ReadKey(true).KeyChar;

            }

            Console.WriteLine("Finis!");

        }
    }
}