Program.cs

// See https://aka.ms/new-console-template for more information

Console.WriteLine("Hello, World!");

var logger = log4net.LogManager.GetLogger("Program");

var fileInfo = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "log4net.config");
if (fileInfo.Exists)
    log4net.Config.XmlConfigurator.Configure(fileInfo);
else
    throw new InvalidOperationException("No log config file found");

int count = 0;

while (true)
{
    Thread.Sleep(2000);
    logger.Debug($"Log number {count++}");
    logger.Info($"Log number {count++}");
    logger.Warn($"Log number {count++}");
    logger.Error($"Log number {count++}");
    logger.Fatal($"Log number {count++}");
}