In order to add objects from the Session use the following method:

Listing 5

HttpSessionState.Session.Add(name,value);

This adds an object to the Session state, the name and the value of the item to be added being passed to this method as parameters.  Further, the HttpSessionState class is present in the System.Web namespace in the System.Web.dll file.

Alternatively, we can add objects to the Session.

Listing 6

HttpSessionState.Session[“UserName”] = “Joydip”;

This automatically creates a new item called “UserName” in the Session State Collection (if none exists) and sets its value to “Joydip.”

The following method is used to retrieve a previously stored object from the Session state.

Listing 7

string userName = HttpSessionState.Session["UserName"].ToString();

Note that the ToString() method is called because data is stored in the Session state as objects. Therefore, the conversion or casting to the appropriate type is necessary in the above example to retrieve the current User’s name as a string.

The following method is used to remove an object from the Session state.

HttpSessionState.Remove(objectName);

This method deletes the object specified as parameter from the Session State Collection, provided the same exists.  In this case, if the session-state collection does not contain the element specified, the collection remains unchanged, but no exception is thrown.

To clear the Session use either of the following:

Session.Abandon();

or

Session.Clear();

The difference between the Session.Abandon() and the Session.Clear() method is that if you call Session.Abandon(), Session_End will be fired (for InProc mode) and in the next request, Session_Start will be fired.  Session.Clear( ) just clears the session data without killing it.