While working with ASP.NET web application you must be familiar with one of most important state management technique “Session”.

ASP.NET Session State is on by default, hence you are paying for memory even if you don’t use it. There are several ways to optimize it.


Tip #1
: Not using Session State at all ? Then turn it off completely in web.config



Tip #2
: Session is only required for few pages not all over the application



then enable it for a specific page where you required the session




Tip #3
: If you are using Session for Reading Purpose, use Session State as “ReadOnly”

If you are a beginner, you must be wondering what is EnableSessionState=”Readonly” . Well, if you look at your web application, not all the pages using Session or some of the pages is using session data for reading purpose. If there is no write operation happaning on session, then it’s always better to use session State is “
ReadOnly



The session request pass through different httpModule with in HTTPPipeline. Know more details on how session state ReadOnly works , please read the article
Read Only Session State in ASP.NET.

You can also set ReadOnly SessionState in web.config as well




Tip #4
: Programmatically Change Session State Behavior when required (ASP.NET 4.0)

We can enable or disabled session state either in web.config or using @Page directive’s EnableSessionState attributes. But there was no provision to change the session state at runtime till date in ASP.NET. But using ASP.NET 4.0, we can change the session state programmatically . The .NET 4.0 framework adds a new method SetSessionStateBehavior to the HttpContext class for ASP.NET. This method required SessionStatebehavior value to set the current session mode. To call SetSessionStateBehavior simply create a new HttpModule by Implementing IHttModule and hook the BeginRequest event. Most important you can only use the SetSessionStateBehavior until the AcquireRequestState event is fired, because
AcquireRequestState Occurs when ASP.NET acquires the current state that is associated with the current request

While calling SetSessionStatebehavior, You can pass the following values as SessionStatebehavior :


-
Default: This is default setting which means everything works as before
- Disabled: Turned of Session Sate for Current Request.
- ReadOnly: Read only access to Session State;
- Required: Enabled session state for both Read and Write Access



Tip #5
: Compress Session Data while using OutProc Session mode based on Requirements (AP.NET 4.0)

ASP.NET 4.0 comes with a new option for compressing the Session data with Out Process Session mode. To enabling this functionality we need to add “
compressionEnabled=”true” attribute with the SessionMode in web.config.



When Compression mode is enabled is web.config, ASP.NET compress the serialized session data and passed it to session storage and during retrieval same deserialization and decompression happens in server side.
ASP.NET 4.0 used System.IO.Compression.GZStream class to compress the session mode.



Tip#6
: Use HttpContext.Current.Items for very short term storage instead of Session

You can use HttpContext.Current.Items for very short term storage. By Short term storage means, this data is valid for a single HTTP Request. There are many confusion around regarding storing data in HttpContext.Current.Items and storing data in Session variable. Items collections of HttpContext is and IDictionary key-value collections and that are shared across a single HTTPRequest. Yes, HttpContext.Current.Items valid for a single HTTPRequest.




Hope the above tips helps you.


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