C#

char[] buffer = new char[] {'H', 'e', 'l', 'l', 'o'};
string str = new string(buffer);

object pvaIn = 1; // PRINT_DONTBOTHERUSER
object pvaOut = null;
axWebBrowser1.ExecWB(OLECMDID.OLECMDID_PRINT,
  OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, ref pvaIn, ref pvaOut);

[StructLayout(LayoutKind.Sequential)]
private struct RECT
{
   public int Left;
   public int Top;
   public int Right;
   public int Bottom;
}
 
enum WM_MESSAGE
{
   WM_NCCALCSIZE = 131,
   WM_NCPAINT = 133,
   WM_NCHITTEST = 132,
   WM_NCLBUTTONDOWN = 161,
}
 
enum WM_NCCALCSIZE
{
   WVR_ALIGNTOP = 16,
   WVR_ALIGNLEFT = 32,
   WVR_ALIGNBOTTOM = 64,
   WVR_ALIGNRIGHT = 128,
   WVR_HREDRAW = 256,
   WVR_VREDRAW = 512,
   WVR_REDRAW = (WVR_HREDRAW | WVR_VREDRAW),
   WVR_VALIDRECTS = 1024
}
 
[StructLayout(LayoutKind.Sequential)]
struct NCCALCSIZE_PARAMS
{
   public RECT rgrc0, rgrc1, rgrc2;
   public IntPtr lppos;
}
 
[StructLayout(LayoutKind.Sequential)]
struct WINDOWPOS
{
   public IntPtr hwnd;
   public IntPtr hwndInsertAfter;
   public int x, y;
   public int cx, cy;
   public int flags;
}
 
[DllImport("User32.dll")]
private extern static IntPtr GetWindowDC( IntPtr hWnd );
 
[DllImport("User32.dll")]
private extern static int ReleaseDC( IntPtr hWnd, IntPtr hDC );
 
[DllImport("User32.dll")] 
public static extern int RedrawWindow(IntPtr hwnd, IntPtr lprcUpdate, IntPtr hrgnUpdate, int fuRedraw);
 
protected override void WndProc(ref Message m)
{
   switch ( m.Msg )
   {
      case (int)WM_MESSAGE.WM_NCCALCSIZE :
         if ( m.WParam == IntPtr.Zero )
         {
            // get the controls bounds
            RECT rect = (RECT) Marshal.PtrToStructure(m.LParam, typeof(RECT));
 
            // set the client area
            rect.Left += 1;
            rect.Top += 5;
            rect.Right -= 1;
            rect.Bottom -= 1;
 
            Marshal.StructureToPtr(rect, m.LParam, false);
         }
         else
         {
            // get the controls bounds
            NCCALCSIZE_PARAMS csp = (NCCALCSIZE_PARAMS)Marshal.PtrToStructure(m.LParam, typeof(NCCALCSIZE_PARAMS));
 
            // set the client area
            csp.rgrc0.Left += 1;
            csp.rgrc0.Top += 5;
            csp.rgrc0.Right -= 1;
            csp.rgrc0.Bottom -= 1;
 
            Marshal.StructureToPtr(csp, m.LParam, false);
         }
         break;
 
         case (int)WM_MESSAGE.WM_NCPAINT :
         {
            IntPtr hDC = GetWindowDC( m.HWnd );
            Graphics g = Graphics.FromHdc( hDC );
 
            // do some paining in the non-client area
            ...
             
            ReleaseDC( m.HWnd, hDC );
         }
         break;
      }
 
      base.WndProc (ref m);
   }
}
 
protected override void OnSizeChanged(EventArgs e)
{
   base.OnSizeChanged(e);
 
   // force redraw of the entire control (including non-client area)
   //RedrawWindow(this.Handle, IntPtr.Zero, IntPtr.Zero, RDW_FRAME | RDW_UPDATENOW | RDW_INVALIDATE); 
}