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printwindow (user32)
 
.
Summary
The PrintWindow function copies a visual window into the specified device context (DC), typically a printer DC.

C# Signature:

   [DllImport("user32.dll", SetLastError = true)]
   [return: MarshalAs(UnmanagedType.Bool)]
   static extern bool PrintWindow(IntPtr hwnd, IntPtr hDC, uint nFlags);

VB Signature:

<DllImport("user32.dll", SetLastError:=True)> _
Private Shared Function PrintWindow(ByVal hwnd As IntPtr, ByVal hDC As IntPtr, ByVal nFlags As UInteger) As Boolean
End Function

User-Defined Types:

None.

Notes:

This function is only available on Windows XP or higher. Windows 2000/9x/ME do not support it.

Tips & Tricks:

To capture only the client area of window, use PW_CLIENTONLY = 0x1 as nFlags

Sample Code:

Screenshotting a form to a Bitmap in C#:

Graphics g = form.CreateGraphics();
Bitmap bmp = new Bitmap(form.Size.Width, form.Size.Height, g);
Graphics memoryGraphics = Graphics.FromImage(bmp);
IntPtr dc = memoryGraphics.GetHdc();
bool success = PrintWindow(form.Handle, dc, 0);
memoryGraphics.ReleaseHdc(dc);
// bmp now contains the screenshot

Me.AutoRedraw = True
PrintWindow Me.hWnd, Me.hDC, 0

Alternative Managed API:

Control.DrawToBitmap()

Or call Control.InvokePaintBackground() followed by Control.InvokePaint().

The ManagedWindowsApi project (http://mwinapi.sourceforge.net) provides a

class ManagedWinapi.SystemWindow that has a Image property

Documentation
PrintWindow on MSDN

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