When I zoom in on an image, GDI+ automatically smoothens the edges
between the pixels. I am looking for a way to see the individual pixels
as squares in the enlarged image, like in MSPaint. I searched in vain in
the enumerations System.Drawing.Drawing2D.SmoothingMode and
System.Drawing.Drawing2D.InterpolationMode to find the constant that
does just that. How?

Some code to illustrate the problem:

using System.Drawing;
using System.Windows.Forms;
class MyForm:Form
{
 override protected void OnPaint(PaintEventArgs a)
 {
  Bitmap bitmap=new Bitmap(2,2);
  Graphics graphics=Graphics.FromImage(bitmap);
  graphics.Clear(Color.Green);
  graphics.DrawLine(Pens.Red,1,1,2,2);
  graphics.Dispose();
  a.Graphics.DrawImage
  (
   bitmap,
   new Rectangle(0,0,200,200),
   new Rectangle(0,0,2,2),
   GraphicsUnit.Pixel
  );
 }
 [System.STAThread]
 static void Main()
 {
  Application.Run(new MyForm());
 }
}