SEOfriendly page names.

Hi,
I am the user of nopcommerce since last 3 years, currently i am having a requirement that in SEName of categories we need a symbol / but as per nop architecture its not allowing us to pass it.
We have added / in okchar of seoextention.cs which is allowing it to be passed to db and bringing it to the url but but giving 404.
Anybody knows how to resolve it.

Are the forward slashes which you have stored in your database already encoded (%2f), or are trying to encode them when writing them to a page?

in Row 279 of seoextentions i have added / and after you said %2f encoding i added  

while (name2.Contains("/"))
  name2 = name2.Replace("/", "%2F");

after row 314.

But after that it is saying
HTTP Error 404.11 - Not Found
The request filtering module is configured to deny a request that contains a double escape sequence.