Convert Bitmaps to transparent png

Not much to say.  This was really useful with an icon set we were using.

 

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            string directory=@"c:\temp\";
            string[] files = Directory.GetFiles(directory, "*.bmp");
            foreach (string path in files)
            {
                Bitmap bmp = new Bitmap(path); 
                bmp.MakeTransparent(Color.Magenta);
                FileInfo fi = new FileInfo(path);
                bmp.Save(directory + fi.Name.Replace(".bmp", "") + ".png", ImageFormat.Png);
                bmp.Dispose();
            }
        }
    }
}