How to get the cookie value in asp.net website

Question

I am creating a cookie and storing the value of username after succesfull login. How can I access the cookie when the website is opened. If the cookie exist I want to fill the username text box from the cookie value. And how to decrypt the value to get the username. I am doing server side validation by getting the userdetails from the database. I am using vs 2010 with c#

FormsAuthenticationTicket tkt;
string cookiestr;
HttpCookie ck;
tkt = new FormsAuthenticationTicket(1, txtUserName.Value, DateTime.Now,
    DateTime.Now.AddYears(1), chk_Rememberme.Checked, "User Email");
cookiestr = FormsAuthentication.Encrypt(tkt);
ck = new HttpCookie(FormsAuthentication.FormsCookieName, cookiestr);

if (chk_Rememberme.Checked)
{
    ck.Expires = tkt.Expiration;
    ck.Path = FormsAuthentication.FormsCookiePath;
    Response.Cookies.Add(ck);
}

cookie is created with name as .YAFNET_Authentication and content is encrypted

Webconfig:

  <forms name=".YAFNET_Authentication" loginUrl="Home.aspx"
  protection="All" timeout="15000" cookieless="UseCookies"/>

score 117 · Accepted Answer · edited Mar 06 '23 at 21:10

117

You may use Request.Cookies collection to read the cookies:

if (Request.Cookies["key"] != null)
{
   var value = Request.Cookies["key"].Value;
}

edited Mar 06 '23 at 21:10

Joan Gil

282
3
11

answered Dec 13 '11 at 13:39

KV Prajapati

93,659
19
148
186

score 23 · Answer 2 · edited Dec 13 '11 at 13:45

23

FormsAuthentication.Decrypt takes the actual value of the cookie, not the name of it. You can get the cookie value like

HttpContext.Current.Request.Cookies[FormsAuthentication.FormsCookieName].Value;

and decrypt that.

edited Dec 13 '11 at 13:45

KV Prajapati

93,659
19
148
186

answered Dec 13 '11 at 13:44

kvc

1,127
2
7
21

score 8 · Answer 3 · answered Dec 13 '11 at 13:45

add this function to your global.asax

protected void Application_AuthenticateRequest(Object sender, EventArgs e)
{
    string cookieName = FormsAuthentication.FormsCookieName;
    HttpCookie authCookie = Context.Request.Cookies[cookieName];

    if (authCookie == null)
    {
        return;
    }
    FormsAuthenticationTicket authTicket = null;
    try
    {
        authTicket = FormsAuthentication.Decrypt(authCookie.Value);
    }
    catch
    {
        return;
    }
    if (authTicket == null)
    {
        return;
    }
    string[] roles = authTicket.UserData.Split(new char[] { '|' });
    FormsIdentity id = new FormsIdentity(authTicket);
    GenericPrincipal principal = new GenericPrincipal(id, roles);

    Context.User = principal;
}

then you can use HttpContext.Current.User.Identity.Name to get username. hope it helps

score 0 · Answer 4 · edited Jan 19 '15 at 14:59

0

HttpCookie cook = new HttpCookie("testcook");
cook = Request.Cookies["CookName"];
if (cook != null)
{
    lbl_cookie_value.Text = cook.Value;
}
else
{
    lbl_cookie_value.Text = "Empty value";
}

Reference Click here

edited Jan 19 '15 at 14:59

AbcAeffchen

14,400
15
47
66

answered Jan 19 '15 at 05:49

Kesavarapu Venkatesh

242
4
9

How to get the cookie value in asp.net website

4 Answers4

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