FailoverException.cs

public static class MySqlExceptionExtensions
{
    public static bool IsFailoverException(this MySqlException mySqlException)
    {
        return mySqlException.Number == (int)MySqlErrorCode.UnableToConnectToHost ||
               mySqlException.Number == (int)MySqlErrorCode.OptionPreventsStatement ||
               (mySqlException.Number == 0 && mySqlException.HResult == -2147467259); 
        // Fatal error reading from the stream, usually Number being 0 means host connection issues
    }
}