Unique sessionID for asp.net client.

The SessionID property is used to uniquely identify a browser with session data on the server. The SessionID value is randomly generated by ASP.NET and stored in a non-expiring session cookie in the browser. The SessionID value is then sent in a cookie with each request to the ASP.NET application.

If you want to disable the use of cookies in your ASP.NET application and still make use of session state, you can configure your application to store the session identifier in the URL instead of a cookie by setting the cookieless attribute of the sessionState configuration element to true, or to UseUri, in the Web.config file for your application. You can have ASP.NET determine whether cookies are supported by the browser by specifying a value of UseDeviceProfile for the cookieless attribute. You can also have ASP.NET determine whether cookies are enabled for the browser by specifying a value of AutoDetect for the cookieless attribute. If cookies are supported when UseDeviceProfile is specified, or enabled when AutoDetect is specified, then the session identifier will be stored in a cookie; otherwise the session identifier will be stored in the URL.