private static readonly log4net.ILog _logger
            = log4net.LogManager.GetLogger(
                    System.Reflection.MethodBase.GetCurrentMethod()
                     .DeclaringType);

public class SqlAppender : AppenderSkeleton
{
    private static readonly string CommandText = "INSERT INTO Log ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@log_date, @thread, @log_level, @logger, @message, @exception)";
 
    public string ConnectionString { get; set; }
 
    protected override void Append(LoggingEvent loggingEvent)
    {
        using (var conn = new SqlConnection(ConnectionString))
        using (var cmd = new SqlCommand(CommandText, conn))

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