static extern TODO DeviceContext(TODO);

Declare Function DeviceContext Lib "gdi32.dll" (TODO) As TODO

If you are using Graphics as a DeviceContext you can use the DpiX and DpiY attributes. (Julian Taupe)

static extern IntPtr GetDCEx(IntPtr hWnd, IntPtr hrgnClip, DeviceContextValues flags);

Private Shared Function GetDCEx(ByVal hWnd As IntPtr, ByVal hrgnClip As IntPtr, ByVal DeviceContextValues As DeviceContextValues) As IntPtr

Private Declare Function Lib "user32.dll" GetDCEx(ByVal hWnd As IntPtr, ByVal hrgnClip As IntPtr, ByVal DeviceContextValues As DeviceContextValues) As IntPtr

DeviceContextValues

Specifies how the DC is created. This parameter can be one or more of the DeviceContextValues enumeration.</param>

static extern IntPtr GetDCEx(IntPtr hWnd, IntPtr hrgnClip, DeviceContextValues flags);

Private Shared Function GetDCEx(ByVal hWnd As IntPtr, ByVal hrgnClip As IntPtr, ByVal DeviceContextValues As Integer) As IntPtr

Private Declare Function Lib "user32.dll" GetDCEx(ByVal hWnd As IntPtr, ByVal hrgnClip As IntPtr, ByVal DeviceContextValues As Integer) As IntPtr

protected enum DeviceContextValues : uint

Specifies how the DC is created. This parameter can be one or more of the DeviceContextValues enumeration.</param>

    Dim destDeviceContext As IntPtr = g.GetHdc

    Dim srcDeviceContext As IntPtr = GetWindowDC(windowHandle)

    BitBlt(destDeviceContext, 0, 0, size.Width, size.Height, _

           srcDeviceContext, location.X, location.Y, SRCCOPY)

    ReleaseDC(windowHandle, srcDeviceContext)

    g.ReleaseHdc(destDeviceContext)

private enum DeviceContextValues : uint

Private Enum DeviceContextValues As UInteger