Web Browser Control of Windows Form application not handle Half URL Path in Form Action?

  c++, vb.net, windows, winforms

I have HTML the Contain Action Half Path.

But It is not working but when provided for Full Path in Action Code is Working fine.
So is there any property to Set in Web Browser control for Windows Application?

Not Working Code:

form method="post" action="/_abc/xyz?re_url=kn" id="formSubmit" 

Working Code:

form method="post" action="**URLFullPath**/_abc/xyz?re_url=kn" id="formSubmit" 

Source: Windows Questions