Mettre une image en fond a un textBox ou un ComboBox, comment faire?

salut

un truc du genre :

Code:

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private void button1_Click(object sender, EventArgs e)
        {
            Graphics g = textBox1.CreateGraphics();
 
            Image bmi = Bitmap.FromFile(@"c:\windows\plume.bmp");
            IntPtr pTarget = g.GetHdc();
            IntPtr pSource = CreateCompatibleDC(pTarget);
            Bitmap bmp = new Bitmap(bmi);
            IntPtr pOrig = SelectObject(pSource, bmp.GetHbitmap());
            BitBlt(pTarget, 0, 0, bmp.Width, bmp.Height, pSource, 0, 0, TernaryRasterOperations.SRCCOPY);
            IntPtr pNew = SelectObject(pSource, pOrig);
            DeleteObject(pNew);
            DeleteDC(pSource);
            g.ReleaseHdc(pTarget);
        }