Changing Metadirectory _svn to .svn in subversion client (ASPDOTNETHACK / SVN_ASP_DOT_NET_HACK)

While copying  repository , I found that _svn and .svn directories are same folder.
_svn is created automatically. So, I remove it but it was created by something...

Because I know that this is alternative way  for .net web servers.  
I did googling. and  I found it that How to fix it.

1) check system environment varialbes
    - run command prompt.
    - type set
    - you will find  ASPDOTNETHACK or  SVN_ASP_DOT_NET_HACK

2) remove it form 'my computer properties'
       --> advanced system configuration
               --> environment variables
               --> remove this variable

3) reboot your computer.

4) try again copy svn-directory