dc2=GetWindowDC(c.Handle);

[DllImport("coredll.dll", EntryPoint="GetWindowDC", SetLastError=true)]

private static extern IntPtr GetWindowDCCE(IntPtr hWnd);

<DllImport("coredll.dll", EntryPoint:="GetWindowDC", CharSet:=CharSet.Auto, ExactSpelling:=True)> _

Private Shared Function GetWindowDC(ByVal hWnd As HandleRef) As IntPtr

Declare Function GetWindowDC Lib "coredll.dll" (ByVal hWnd As HandleRef) As IntPtr

    Private Declare Auto Function GetWindowDC Lib "user32.dll" (ByVal windowHandle As IntPtr) As IntPtr

    Dim srcDeviceContext As IntPtr = GetWindowDC(windowHandle)

static extern IntPtr GetWindowDC(IntPtr hWnd);

Public Shared Function GetWindowDC(ByVal hWnd As IntPtr) As IntPtr

Declare Function GetWindowDC Lib "user32" (ByVal hWnd As Long) As Long

GetWindowDC is intended for special painting effects within a window's nonclient area. Painting in nonclient areas of any window is not recommended. The GetSystemMetrics function can be used to retrieve the dimensions of various parts of the nonclient area, such as the title bar, menu, and scroll bars. The GetDC function can be used to retrieve a device context for the entire screen.

  Declare Function GetWindowDC Lib "user32" (ByVal hwnd As IntPtr) As IntPtr

    Dim MyGrphHdc As IntPtr = GetWindowDC(Me.Handle)