a custom text logger in C# that will log text to a file created on the user's desktop.

CustomTextLogger.cs

using System;
using System.IO;

public class CustomTextLogger<T>
{
    private readonly string filePath;

    public CustomTextLogger()
    {
        string desktopPath = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);
        string fileName = $"{DateTime.Now:yyyyMMdd}.log";
        filePath = Path.Combine(desktopPath, fileName);
        if (!File.Exists(filePath))
            using (File.Create(filePath)) { }
    }

    public void logText(string content)
    {
        string logLine = $"{DateTime.Now:[yyyy-MM-dd HH:mm:ss]} {content}{Environment.NewLine}";
        using (var writer = new StreamWriter(filePath, true))
        {
            writer.Write(logLine);
            writer.Flush();
        }
    }
}