Asp.Net Dynamic Session variables

Asp.Net allows the session keys to be used dynamically both for assigning values to the session keys and for retrieving values from the session keys.

The normal syntax to assign values to session variables is
Session["UserID"] = "1";

However we can also assign values dynamically as follows.

string strUserName = "UserName";

Session[strUserName] = "User1";

The values can also be retireved dynamically as follows

Response.Write("UserID: " + Session["UserID"].ToString() + "<br>");

Response.Write("UserName: " + Session[strUserName].ToString());

The Output will be

UserID: 1
UserName: User1