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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;
 
 
//Process
using System.Diagnostics;
 
namespace priwin
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
 
 
        [System.Runtime.InteropServices.DllImport("User32.dll")]
        private extern static bool PrintWindow(IntPtr hwnd, IntPtr hDC, uint nFlags);
 
 
        public Bitmap CaptureControl(Control ctrl)
        {
            Bitmap img = new Bitmap(ctrl.Width, ctrl.Height);
            Graphics memg = Graphics.FromImage(img);
            IntPtr dc = memg.GetHdc();
            PrintWindow(ctrl.Handle, dc, 0);
            memg.ReleaseHdc(dc);
            memg.Dispose();
            return img;
        }
 
 
 
        private void button1_Click(object sender, EventArgs e)
        {
 
            //Process.GetProcessesByName("notepad");
 
            Bitmap bmp = CaptureControl(this);
 
            bmp.Save("C:\\Users\\hogehoge\\Pictures\\1.png");
 
            bmp.Dispose();
 
        }
    }
}

Main.java:1: error: class, interface, or enum expected
using System;
^
Main.java:2: error: class, interface, or enum expected
using System.Collections.Generic;
^
Main.java:3: error: class, interface, or enum expected
using System.ComponentModel;
^
Main.java:4: error: class, interface, or enum expected
using System.Data;
^
Main.java:5: error: class, interface, or enum expected
using System.Drawing;
^
Main.java:6: error: class, interface, or enum expected
using System.Linq;
^
Main.java:7: error: class, interface, or enum expected
using System.Text;
^
Main.java:8: error: class, interface, or enum expected
using System.Threading.Tasks;
^
Main.java:9: error: class, interface, or enum expected
using System.Windows.Forms;
^
Main.java:13: error: class, interface, or enum expected
using System.Diagnostics;
^
Main.java:15: error: class, interface, or enum expected
namespace priwin
^
Main.java:17: error: class, interface, or enum expected
    public partial class Form1 : Form
           ^
Main.java:17: error: '{' expected
    public partial class Form1 : Form
                              ^
Main.java:26: error: illegal start of type
        [System.Runtime.InteropServices.DllImport("User32.dll")]
        ^
Main.java:26: error: ';' expected
        [System.Runtime.InteropServices.DllImport("User32.dll")]
         ^
Main.java:26: error: illegal start of type
        [System.Runtime.InteropServices.DllImport("User32.dll")]
               ^
Main.java:26: error: ';' expected
        [System.Runtime.InteropServices.DllImport("User32.dll")]
                       ^
Main.java:26: error: <identifier> expected
        [System.Runtime.InteropServices.DllImport("User32.dll")]
                                                 ^
Main.java:26: error: illegal start of type
        [System.Runtime.InteropServices.DllImport("User32.dll")]
                                                  ^
Main.java:26: error: ';' expected
        [System.Runtime.InteropServices.DllImport("User32.dll")]
                                                               ^
Main.java:27: error: <identifier> expected
        private extern static bool PrintWindow(IntPtr hwnd, IntPtr hDC, uint nFlags);
                      ^
Main.java:56: error: class, interface, or enum expected
}
^
22 errors

Standard output is empty