_OldFontH = Gdi.SelectObject(dc, fontH);

                IntPtr disposeFontH = Gdi.SelectObject(dc, _OldFontH);

static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

    IntPtr pOrig = SelectObject(pSource, bmp.GetHbitmap(Color.Black));

    IntPtr pNew = SelectObject(pSource, pOrig);

Use SelectObject to select a source image into the source DC before trying to BitBlt it.

static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

    IntPtr pOrig = SelectObject(pSource, bmp.GetHbitmap());

    IntPtr pOrig = SelectObject(pDC, hbitmap);

    IntPtr oldpen = SelectObject(pDC, pen);

    DeleteObject(SelectObject(pDC, oldpen));

    SelectObject(pDC, pOrig);

public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

    IntPtr vPreviouseBrush = SelectObject(vDC, vBrush);

    SelectObject(vDC, vPreviouseBrush);

     IntPtr hObjOld = SelectObject(hDC, hFont);

     SelectObject(hDC, hObjOld);

        IntPtr OldFont = SelectObject(this.DC, this.Font);

        SelectObject(this.DC, OldFont);

As a prerequisite a font handle has to be loaded into the device context using the SelectObject method in gdi32.dll.

    private static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

    ///  Use <see cref="SelectObject"/> for loading the font into a device context.</param>

            SelectObject(hdc, fontHandle);

    public extern static IntPtr SelectObject(IntPtr hDC, IntPtr hObject);

        IntPtr old = SelectObject(hdc, hFont);

        SelectObject(hdc, old);

                    IntPtr prev = SelectObject(hdc, font.ToHfont());                    

    IntPtr oldfnt = GDI.SelectObject(hdc, font.ToHfont());

    GDI.DeleteObject(GDI.SelectObject(hdc, oldfnt));

    IntPtr oldfnt = GDI.SelectObject(hdc, font.ToHfont());

    GDI.DeleteObject(GDI.SelectObject(hdc, oldfnt));

     IntPtr hFontPreviouse = SelectObject(hDC, hFont);

     SelectObject(hDC, hFontPreviouse);

static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

      IntPtr hFontPrevious = Win32::SelectObject(hDC, hFont);

      Win32::SelectObject(hDC, hFontPrevious);

    IntPtr pOrig = SelectObject(pDC, hbitmap);

    IntPtr oldpen = SelectObject(pDC, pen);

    DeleteObject(SelectObject(pDC, oldpen));

    SelectObject(pDC, pOrig);

    IntPtr pOrig = SelectObject(pDC, hbitmap);

    IntPtr oldpen = SelectObject(pDC, pen);

    DeleteObject(SelectObject(pDC, oldpen));

    SelectObject(pDC, pOrig);

    public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

        IntPtr oldPen = GDI32.SelectObject(hDC, thePen);

        IntPtr oldBrush = GDI32.SelectObject(hDC, theBrush);        

        GDI32.SelectObject(hDC, oldPen);

        GDI32.SelectObject(hDC, oldBrush);            

[DllImport("gdi32.dll", EntryPoint = "SelectObject")]

public static extern IntPtr SelectObject([In] IntPtr hdc, [In] IntPtr hgdiobj);

Public Shared Function SelectObject(ByVal hdc As IntPtr, ByVal hObject As IntPtr) As IntPtr

Public Declare Function SelectObject Lib "gdi32.dll" _

    public static extern int SelectObject(IntPtr hDC, int hGdiObject);

int hOldPen = SelectObject(hDC, hPen);

int hOldBrush = SelectObject(hDC, hBrush);

SelectObject(hDC, hOldPen);

SelectObject(hDC, hOldBrush);

                IntPtr pOrig = SelectObject(pSource, hbmp);

                IntPtr pNew = SelectObject(pSource, pOrig);

        static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

   public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

       //a color that you set through SelectObject the .net garbage collector will

    //We have to use SelectObject to set the font, color and other properties.

    IntPtr last_font = SelectObject(HDC, Font.ToHfont());

        DeleteObject(SelectObject(HDC, last_font));

    Private Shared Function SelectObject(ByVal hdc As IntPtr, ByVal hgdiobj As IntPtr) As IntPtr

            FontPtr = SelectObject(Hdc, myFont.ToHfont())

            oldBitmap = Win32.SelectObject(memDc, hBitmap);

                Win32.SelectObject(memDc, oldBitmap);

        public extern static IntPtr SelectObject(IntPtr hDC, IntPtr hObject);

        EMR_SELECTOBJECT           = 37,

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

private static extern IntPtr SelectObjectCE(IntPtr hdc, IntPtr hgdiobj);

Declare Function SelectObject Lib "coredll.dll" (TODO) As TODO