How can I create persistent cookies in ASP NET

Question

I am creating cookies with following lines  HttpCookie userid   new HttpCookie  quot userid quot   objUser id ToString     userid Expires AddYears 1   Response Cookies Add userid    Now how can I make it persistent  If I visit the same page again after closing the browser  I m unable to get it back

User · Answer

add cookie  var panelIdCookie   new HttpCookie  panelIdCookie    panelIdCookie Values Add  panelId   panelId ToString CultureInfo InvariantCulture    panelIdCookie Expires   DateTime Now AddMonths 2    Response Cookies Add panelIdCookie       read cookie      var httpCookie   Request Cookies  panelIdCookie                    if  httpCookie    null                                        panelId   Convert ToInt32 httpCookie  panelId

User · Answer

Although the accepted answer is correct  it does not state why the original code failed to work   Bad code from your question   HttpCookie userid   new HttpCookie  userid   objUser id ToString     userid Expires AddYears 1   Response Cookies Add userid     Take a look at the second line  The basis for expiration is on the Expires property which contains the default of 1 1 0001  The above code is evaluating to 1 1 0002  Furthermore the evaluation is not being saved back to the property  Instead the Expires property should be set with the basis on the current date   Corrected code   HttpCookie userid   new HttpCookie  userid   objUser id ToString     userid Expires   DateTime Now AddYears 1   Response Cookies Add userid

User · Answer

As I understand you use ASP NET authentication and to set cookies persistent you need to set FormsAuthenticationTicket IsPersistent   true It is the main idea   bool isPersisted   true  var authTicket   new FormsAuthenticationTicket  1  user name   DateTime Now  DateTime Now AddYears 1    Expiration  you can set it to 1 year  isPersisted   THIS IS THE MAIN FLAG addition data       HttpCookie authCookie   new HttpCookie FormsAuthentication FormsCookieName  authTicket        if  isPersisted          authCookie Expires   authTicket Expiration   HttpContext Current Response Cookies Add authCookie

User · Answer

Here s how you can do that   Writing the persistent cookie     create a cookie HttpCookie myCookie   new HttpCookie  myCookie       Add key-values in the cookie myCookie Values Add  userid   objUser id ToString        set cookie expiry date-time  Made it to last for next 12 hours  myCookie Expires   DateTime Now AddHours 12      Most important  write the cookie to client  Response Cookies Add myCookie     Reading the persistent cookie     Assuming user comes back after several hours  several  lt  12    Read the cookie from Request  HttpCookie myCookie   Request Cookies  myCookie    if  myCookie    null          No cookie found or cookie expired        Handle the situation here  Redirect the user or simply return       ok - cookie is found    Gracefully check if the cookie has the key-value as expected  if   string IsNullOrEmpty myCookie Values  userid           string userId   myCookie Values  userid   ToString          Yes userId is found  Mission accomplished

User · Answer

You need to add this as the last line     HttpContext Current Response Cookies Add userid     When you need to read the value of the cookie  you d use a method similar to this       string cookieUserID  String Empty       try               if  HttpContext Current Request Cookies  userid      null                        cookieUserID   HttpContext Current Request Cookies  userid                        catch  Exception ex                 handle error            return cookieUserID

User · Answer

FWIW be very careful with storing something like a userid in a cookie unencrypted  Doing this makes your site very prone to cookie poisoning where users can easily impersonate another user  If you are considering something like this I would highly recommend using the forms authentication cookie directly   bool persist   true   var cookie   FormsAuthentication GetAuthCookie loginUser ContactId  persist    cookie Expires   DateTime Now AddMonths 3    var ticket   FormsAuthentication Decrypt cookie Value    var userData    store any string values you want inside the ticket                  extra than user id that will be encrypted   var newTicket   new FormsAuthenticationTicket ticket Version  ticket Name       ticket IssueDate  ticket Expiration  ticket IsPersistent  userData    cookie Value   FormsAuthentication Encrypt newTicket    Response Cookies Add cookie     Then you can read this at any time from an ASP NET page by doing   string userId   null  if  this Context User Identity IsAuthenticated         userId   this Context User Identity Name

[asp.net] How can I create persistent cookies in ASP.NET?

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