private void DrawPieInt(object sender, PaintEventArgs e)
        {
            //e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            Pen blackPen = new Pen(Color.Black, 2);
            Brush fill_brush = Brushes.White;
            int x = 0;
            int y = 0;
            int a = 256;
            int diametr = Convert.ToInt32(a * Math.Sqrt(2))+5;
            int sdvig = (diametr - a) / 2;
            int C_h = diametr;
            int C_w = diametr;
            int name;
            Bitmap img;
            int startAngle = -90;
            int sweepAngle = -360;
            for (int i = 0; i < 360; i++)
            {
                if(i==0)
                    Thread.Sleep(100);   
                else
                    sweepAngle = sweepAngle + 1;
                e.Graphics.FillPie(fill_brush, x - sdvig, y - sdvig, C_w, C_h, startAngle, sweepAngle);
                e.Graphics.DrawPie(blackPen, x - sdvig, y - sdvig, C_w, C_h, startAngle, sweepAngle);
                e.Graphics.DrawRectangle(blackPen, x, y, a, a);
                Thread.Sleep(50);
                img = ScreenCapture.CaptureActiveWindow();
                img.MakeTransparent(Color.FromArgb(0, 0, 0));
                name = i + 1;
                img.Save(@"C:\Users\Lenovo\Desktop\anim_photo\" + name + ".png", System.Drawing.Imaging.ImageFormat.Png);
                Thread.Sleep(50);
                e.Graphics.Clear(Color.Black);
            }

public class ScreenCapture
        {
            [DllImport("user32.dll")]
            private static extern IntPtr GetForegroundWindow();

            [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
            public static extern IntPtr GetDesktopWindow();

            [StructLayout(LayoutKind.Sequential)]
            private struct Rect
            {
                public int Left;
                public int Top;
                public int Right;
                public int Bottom;
            }

            [DllImport("user32.dll")]
            private static extern IntPtr GetWindowRect(IntPtr hWnd, ref Rect rect);

            public static Image CaptureDesktop()
            {
                return CaptureWindow(GetDesktopWindow());
            }

            public static Bitmap CaptureActiveWindow()
            {
                return CaptureWindow(GetForegroundWindow());
            }

            public static Bitmap CaptureWindow(IntPtr handle)
            {
                var rect = new Rect();
                GetWindowRect(handle, ref rect);
                var bounds = new Rectangle(rect.Left, rect.Top, rect.Right - rect.Left, rect.Bottom - rect.Top);
                var result = new Bitmap(bounds.Width, bounds.Height);

                using (var graphics = Graphics.FromImage(result))
                {
                    graphics.CopyFromScreen(new Point(bounds.Left, bounds.Top), Point.Empty, bounds.Size);
                }

                return result;
            }
        }