What does IntPtr.Zero mean in System.Drawing.Graphics
<p>I need to get the exact meaning of IntPtr.Zero in below function.
I used this function for convert word document text range position pixel value to WPF unit value.</p>

<pre><code>Graphics g = Graphics.FromHwnd(IntPtr.Zero)
</code></pre>

<p>That normally said to pass the handle,but I didn't get it.</p>