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HttpListenerResponse adding a 2nd cookie makes all cookies disappear

I have the following code:
void WriteConnectionId(HttpListenerContext context, string id)
{
var cookie = context.Response.Cookies[CookieConnectionId];
if (cookie == null)
{
cookie = new Cookie(CookieConnectionId, id)
{
HttpOnly = true,
Secure = true,
Path = "/"
};
context.Response.Cookies.Add(cookie);
}
else
{
cookie.Value = id;
}
//context.Response.SetCookie(new Cookie("lalala", "lololo"));
}
This code stores correctly the cookie for "connection Id" in the client. In Chrome's console I can see the cookie in the list of cookies.
However, if I uncomment the last line that adds an extra cookie, then neither the session cookie or the dummy cookie make it to the client. They do not appear in Chrome's console.
Edit: removing the "/" path on the first cookie makes the first cookie appear, though with both values from the 1st and 2nd cookie concatenated with a comma.

Try
context.Response.AppendCookie(new Cookie("lalala", "lololo"));

I ended up fixing this issue by creating the following function:
void FlushCookie(HttpListenerContext context, Cookie cookie)
{
var builder = new StringBuilder();
builder.Append(cookie.Name);
builder.Append("=");
builder.Append(HttpUtility.HtmlAttributeEncode(cookie.Value));
builder.Append(";");
context.Response.Headers.Add(HttpResponseHeader.SetCookie, builder.ToString());
}
This can be modified further to add cookie expiration, path, etc.

Unable to update cookies in asp.net mvc

I can write and read cookies but I can't change value for existing cookie it always has first set value. I found few ways how it can be implemented but no one works. Here is my code:
private void AddPost(string key)
{
var context = System.Web.HttpContext.Current;
var request = context.Request;
var response = context.Response;
var cookie = request.Cookies[Constants.PostsViewing];
if (cookie == null || string.IsNullOrEmpty(cookie.Value))
{
response.Cookies.Add(new HttpCookie(Constants.PostsViewing, key)
{
Expires = DateTime.Now.AddDays(365)
});
}
else
{
if (cookie.Value.Split(';').Contains(key))
{
return;
}
var v = cookie.Value + ";" + key;
cookie.Value = v;
cookie.Expires = DateTime.Now.AddDays(365);
response.Cookies.Add(cookie);
// this way also doesn't work
//cookie.Value = v;
//response.AppendCookie(cookie);
// and this
//response.Cookies[Constants.PostsViewing].Value = v;
//response.Cookies[Constants.PostsViewing].Expires = DateTime.Now.AddDays(365);
}
}
According to msdn cookie file should be owerwritten.
Each cookie must have a unique name so that it can be identified later when reading it from the browser. Because cookies are stored by name, naming two cookies the same will cause one to be overwritten.
Do you have any idea how to fix it?

I just ran into this exact scenario with a similar block of code:
public ActionResult Index(int requestValue)
{
var name = "testCookie";
var oldVal = Request.Cookies[name] != null ? Request.Cookies[name].Value : null;
var val = (!String.IsNullOrWhiteSpace(oldVal) ? oldVal + ";" : null) + requestValue.ToString();
var cookie = new HttpCookie(name, val)
{
HttpOnly = false,
Secure = false,
Expires = DateTime.Now.AddHours(1)
};
HttpContext.Response.Cookies.Set(cookie);
return Content("Cookie set.");
}
The first time that code would run, the cookie would be set without incident. But any subsequent run would never update it at all (value or expiration).
Turns out, the semi-colon is an illegal character in a cookie value, and trying to delimit your values with it will cause the cookie value to be truncated. If we change the semi-colon to another character, like a pipe (|), everything works out just fine.
Consider the header sent for a cookie value (courtesy of Fiddler):
Response sent 61 bytes of Cookie data:
Set-Cookie: testCookie=2;1; expires=Tue, 09-Sep-2014 19:23:43 GMT; path=/
As we can see, the semi-colon is being used to separate the individual parts of the cookie definition. Thus, if you want to use a semi-colon in cookie value itself, it must be encoded so as not to be misinterpreted. This answer gives a more detailed look into the actual specification: https://stackoverflow.com/a/1969339/143327.

You can't use a semi-colon, in plain text, as your delimiter.
According to the ancient Netscape cookie_spec:
This string is a sequence of characters excluding semi-colon, comma and white space.

You can't directly modify a cookie. Instead you are creating a new cookie to overrite the old one.
http://msdn.microsoft.com/en-us/library/vstudio/ms178194(v=vs.100).aspx
Try
var v = cookie.Value + ";" + key;
Response.Cookies[Constants.PostsViewing].Value = v;
Response.Cookies[Constants.PostsViewing].Expires = DateTime.Now.AddDays(365);
This should change the client Response instead of the servers Request.
In order to use Response.AppendCookie, you first have to get a HttpCookie from your Cookies collection.

C# persistent cookie

I have seen the persistent cookies examples in ASP.NET MVC C# here on stackoverflow.
But I can't figure out why the code below isn't working.
First I write to the cookie:
HttpCookie cookie = new HttpCookie("AdminPrintModule");
cookie.Expires = DateTime.Now.AddMonths(36);
cookie.Values.Add("PrinterSetting1", Request.QueryString["Printer1"]);
cookie.Values.Add("PrinterSetting2", Request.QueryString["Printer2"]);
cookie.Values.Add("PrinterSetting3", Request.QueryString["Printer3"]);
Response.Cookies.Add(cookie);
I see the cookies stored in Internet Explorer. The content looks OK.
Then the reading code:
HttpCookie cookie = Request.Cookies["AdminPrintModule"];
test = cookie.Values["PrinterSetting2"].ToString();
The cookie variable keeps null . Storing the PrinterSetting2 value in the test variable fails.
I don't know what I'm doing wrong because this is more or less a copy-paste from the examples here on stackoverflow. Why can't I read the PrinterSetting2 value from the cookie ?

try with below code :-
if (Request.Cookies["AdminPrintModule"] != null)
{
HttpCookie cookie = Request.Cookies["AdminPrintModule"];
test = cookie["PrinterSetting2"].ToString();
}
Have a look at this document http://www.c-sharpcorner.com/uploadfile/annathurai/cookies-in-Asp-Net/ :-
Below are few types to write and read cookies :-
Non-Persist Cookie - A cookie has expired time Which is called as
Non-Persist Cookie
How to create a cookie? Its really easy to create a cookie in the
Asp.Net with help of Response object or HttpCookie
Example 1:
HttpCookie userInfo = new HttpCookie("userInfo");
userInfo["UserName"] = "Annathurai";
userInfo["UserColor"] = "Black";
userInfo.Expires.Add(new TimeSpan(0, 1, 0));
Response.Cookies.Add(userInfo);
Example 2:
Response.Cookies["userName"].Value = "Annathurai";
Response.Cookies["userColor"].Value = "Black";
How to retrieve from cookie?
Its easy way to retrieve cookie value form cookes by help of Request
object. Example 1:
string User_Name = string.Empty;
string User_Color = string.Empty;
User_Name = Request.Cookies["userName"].Value;
User_Color = Request.Cookies["userColor"].Value;
Example 2:
string User_name = string.Empty;
string User_color = string.Empty;
HttpCookie reqCookies = Request.Cookies["userInfo"];
if (reqCookies != null)
{
User_name = reqCookies["UserName"].ToString();
User_color = reqCookies["UserColor"].ToString();
}

You must ensure that you have values in Request.QueryString.Just to check if your code works hard code values of cookies and then read from cookie.

Problem retrieving an access token with code returned

I am having a problem retrieving the user's access token after he/she has authorized my Facebook application to access their information and post for them, etc... Facebook returns a code query string to my website, so I can receive the access token for the user. I use the following code to get the access code.
string AppKey = "[REMOVED]";
string AppSecret = "[REMOVED]";
var oAuth = new Facebook.FacebookOAuthClient();
oAuth.AppId = AppKey;
oAuth.AppSecret = AppSecret;
oAuth.RedirectUri = new Uri("http://www.mywebsite.com");
Label3.Text = Request.QueryString["code"];
try
{
var accessToken = oAuth.ExchangeCodeForAccessToken(Request.QueryString["code"]);
string accessTokenString = accessToken.ToString();
HttpCookie aCookie = new HttpCookie("MyWebsite_FBAccessToken");
aCookie.Value = accessTokenString;
Response.Cookies.Add(aCookie);
Response.Redirect("~/Process/ProcessToken.aspx");
}
catch (Facebook.FacebookOAuthException error)
{
Label2.Text = error.Message;
}
My code gets held up here:
var accessToken = oAuth.ExchangeCodeForAccessToken(Request.QueryString["code"]);
And I receive the following error.
(OAuthException) Error validating verification code.
Does this seem like there is a problem with my code, or does it look like there may be a setting problem with my Facebook application? I know my App ID and Secret are correct.

FormsAuthenticationTicket.Version returns invalid version number

Is there any limit on the size/numbers in the version number of the FormsAuthenticationTicket.
I tried to create an ASP.NET cookie using forms authentication, with a large version number(ex: 1234567 need this number for identification purposes). But when I decrypt the cookie I get 135 as the version number.
Initially the old forms authentication cookie was removed, in order to add new information.
Response.Cookies.Remove(FormsAuthentication.FormsCookieName);
Following is the code I used to create the FormsAuthentication cookie.
FormsAuthenticationTicket newAuthTicket = new FormsAuthenticationTicket(1234567, un, DateTime.Now, DateTime.Now.AddHours(5F), false, user_data);
HttpCookie newauthCookie = new HttpCookie(FormsAuthentication.FormsCookieName, FormsAuthentication.Encrypt(newAuthTicket));
Response.Cookies.Add(newauthCookie);
After retrieving the cookie, the version number I got was 135. This number varies with different version numbers.
string cookieName = FormsAuthentication.FormsCookieName;
HttpCookie authCookie = Context.Request.Cookies[cookieName];
if (authCookie == null)
{
return;
}
FormsAuthenticationTicket authTkt = null;
authTkt = FormsAuthentication.Decrypt(authCookie.Value);
if (authTkt == null)
{
return;
}
int versionID = authTkt.Version;
Can someone let me know if it's a bad idea to use such big version numbers, or am I missing something in this.
Thanks for your help,
Vijay

make sure that the ticket name is not passed as null.