override session binding in asp.net c#

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C#

ASP.NET

session

Is there any event which is fired when a value in the session is set.

Example:

On page:
www.abc.aspx?param=one and having code: Session["data"]="some data1";
www.abc.aspx?param=two and having code: Session["data"]="some data2";

I am searching for some event where i can change the key of the session some thing like this:

void SessionOverriding(object sender,Event ev)
{
string key= sender.geySessionKey("data"); // that is 'data' in my case
string qryString=sender.getQueryString("param"); // that will change for every page

string mydata=sender.getSessionData();

Session[key+qryString]=mydata;

}