how to save data in session

Hi,

You can rather create class and store all data in object than creating multiple number of session like below

// To Set Into Session
UserData user = new UserData
{
    FirstName = FirstNameTextBox.Text,
    LastName = LastNameTextBox.Text,
    Mobile = MobileTextBox.Text,
    Tell = TellTextBox.Text,
    Address = AddressTextBox.Text
};
Session["UserData"] = user;

// To Get from Session
if (Session["UserData"] != null)
{
    UserData userData = Session["UserData"] as UserData;
    string firstName = userData.FirstName;
    string lastName = userData.LastName;
    //same for mobile,tell and Address
}

UserData(class)

public class UserData
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Mobile { get; set; }
    public string Tell { get; set; }
    public string Address { get; set; }
}

I hope this will help you out.