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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace WindowsFormsApplication1
 
    public static Bitmap cropAtRect(this Bitmap b, Rectangle r)
{
    Bitmap nb = new Bitmap(r.Width, r.Height);
    Graphics g = Graphics.FromImage(nb);
    g.DrawImage(b, -r.X, -r.Y);
    return nb;
}

prog.cs(13,10): error CS1514: Unexpected symbol `public', expecting `.' or `{'
prog.cs(13,18): error CS1525: Unexpected symbol `Bitmap', expecting `class', `delegate', `enum', `interface', `partial', or `struct'
Compilation failed: 2 error(s), 0 warnings

Standard output is empty