[Security ]Secure flag for session related cookies in c#

Question

 First i want that ASP.NET_SessionId  whose securtiy  is set to be true.

 

 Then i achieved by following statement which is given below: 

 <httpCookies  requireSSL="true">

After setting in web  Config secure flag became true .

 

But all session value is null when redirect  to another page.

 

I want my session would not null as well as secure flag is  true.

 

 

Thanks in Adavance.