How to implement login session in asp.net and C#

In C# you can define a session variable like this:

Session["userame"]= txtusername.Text;

where txtusername is a text box. In another page you can call it as:

string usrname = Session["username"].ToString();

To check whether a user is logged in or not, in a particular page; you'll have to check if this session is empty or not. If the session is null then redirect the user to login page else he/she can view the page. Same logic applies to all the pages where you want to implement the session validation. Sample (on Page_Load event):

if (Session["username"] == null)
   Response.Redirect ("Login.aspx");

Hope it helps... :)

The question is broad answer, in Simply you can follow like this

• Create database, user table in sql server or any database of your choice
• Create the login form with userid and password
• Check them with database for user availability
• If User exist and password matches create a session, like Session.Add ("Userid", txtUserid.Text);

• In other pages (restricted pages where only registered users allowed) write this code in every page load event

  if (Session["Userid"] == null) Response.Redirect ("Login.aspx");

Session["login_user"] = "[username]";
string username = Session["login_user"].ToString().Trim();

Easiest way to implement session is as following:

Session["SessionName"] = Value;

For retrieving value

String variable = Session["SessionName"].ToString();

Note: Session variable can be of any type.

Generally session is used for checking whether the user is logged in or not.