adding multiple data to session

You can create a property class and store values in the property class object and then store that object in session

can u give a example

//Class
public class SessionData
{
    public string CityName { get; set; }

    public string Age { get; set; }
}

//To use

//Store
        List<SessionData> list = new List<SessionData>();
        SessionData data = new SessionData();
        data.CityName = "Mumbai";
        data.Age = "30";
        list.Add(data);

        data = new SessionData();
        data.CityName = "Delhi";
        data.Age = "35";
        list.Add(data);

        Session["Data"] = list;

        //Get
        List<SessionData> list2 = (List<SessionData>)Session["Data"];

but the issue is i cant hardcode the

 public string CityName { get; set; } etc

as it depends on the user  click of wht session i need to create

i hope u understand the excat issue

If you have City value then store City Value else don't store it. If you want to store multiple values this is the way else you can use a datatable