C#

ImageConverter converter = new ImageConverter();
byte[] raw = new byte[1];
Bitmap test = new Bitmap(OFD_Open.FileName);

raw = (byte[])converter.ConvertTo(test, typeof(byte[]));

string output = Convert.ToBase64String(raw);
File.WriteAllText("image.txt", output);

byte[] raw = new byte[1];
Bitmap pic = new Bitmap(1, 1);
raw = Convert.FromBase64String(OFD_Open.FileName);
PictureBox box = new PictureBox();

TypeConverter tc = TypeDescriptor.GetConverter(typeof(Bitmap));
pic = (Bitmap)tc.ConvertFrom(raw);