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public class Logger
{
    public static string LogFile { get; set; }

    static Logger()
    {
        if (string.IsNullOrEmpty(LogFile))
        {
            var path = System.Reflection.Assembly.GetEntryAssembly().Location;
            LogFile = string.Format("{0}\MyLogFile.txt", path);
        }
    }

    public static void Info(string message)
    {
        using (var sr = new StreamWriter(LogFile, true))
        {
            sr.WriteLine(message);
        }
    }
}