Question

I getting a exception to retrieve session value in following condition.

1. if I open site with this link http://example.com and assign session value
2. Page will be redirect to the another site http://example1.com.
3. some action at http://example1.com
4. redirect to http://www.example.com (not http://example.com) and retrieve session value

in this situation system throw exception… but if i open site with http://www.example.com then working fine.

I have some questions

1. Difference between http://example.com and http://www.example.com?
2. how can resolve that problem because it is not necessary that user will type http://www.example.com.

Answer 1

Putting it very simply, http://site.com and http://www.site.com are two separate sites. This is because of the way DNS is setup for a domain name. You can configure the DNS record for a domain name to point both at the same IP address, or you could use a URLRewrite rule to force traffic one way or the other.

Take a look at this for more info:

Specify a canonical domain name for your site with IIS 7