Program.cs

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace DrawPad
{
    class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            //Triangle();
            //Must be set before any window is created. Without it Windows treats the
            //process as DPI unaware and stretches the whole window as a bitmap, which
            //makes the drawing blurred on any display scaled above 100%.
            Application.SetHighDpiMode(HighDpiMode.PerMonitorV2);
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new FormMain());
        }
    }
}