Phoenix (and other servers) compilation & run issue.

       _con = Testing
                ? new MySqlConnection(
                    "Server=127.0.0.1;Database=rotmg;uid=root;password=123456;Pooling=true;Connection Timeout=30;MinimumPoolSize=10;maximumpoolsize=1200;")
                : new MySqlConnection(
                    "Server=127.0.0.1;Database=rotmg;uid=root;password=123456;Pooling=true;Connection Timeout=30;MinimumPoolSize=10;maximumpoolsize=1200;");
            _con.Open();

 private static string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["conn"];
        private static string UseDb = "USE " + System.Configuration.ConfigurationSettings.AppSettings["db"] + ";";

        public static bool SetConnection()
        {
            try
            {
                connection = new MySqlConnection(ConnectionString);
                connection.Open();
                blablabla, other params
                }
             catch (MySqlException ex)
            {
                P.L.Info("MySQL Error: {0}", ex);
                return false;
            }
            return true;
        }
/* Also, as you know, AppConfig.xml: */
<?xml version="1.0"?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
    </startup>
  <appSettings>
    <add key="conn" value="server=localhost;userid=root;
            password=123456;database=rotmg;charset=utf8;"/>
    <add key="db" value="rotmg"/>
  </appSettings>
</configuration>