static extern bool GetTextExtentPoint32(IntPtr hdc, string lpString,

static extern bool GetTextExtentPoint32(IntPtr hdc, string lpString, int cbString, out SIZE lpSize);

    GDI.GetTextExtentPoint32(hdc, text, text.Length,out sz);

static extern bool GetTextExtentPoint32(IntPtr hdc, string lpString,

static extern bool GetTextExtentPoint32(IntPtr hdc, string lpString,

    GDI.GetTextExtentPoint32(hdc, text, text.Length,out sz);

   static extern bool GetTextExtentPoint(IntPtr hdc, string lpString,

       //Do the GetHdc(), GetTextExtentPoint, etc, here. Remember that you have

             GetTextExtentPoint(HDC, line, line.Length, ref MeasureSize);

Setting lpnFit and alpDx to null will get you the functionality of GetTextExtentPoint.