Exception calling Add. Part of cookie is invalid

Question

I am using the Add method of System.Net.CookieContainer. It has worked well over the years but suddenly I am getting:

Exception calling "Add" with "2" argument(s): "The 'Value'='321,386,%2F%3Fa%3D1,http%3A%2F%2Fwww.xxxx.com%2Fpremium%2Fmoney' part of the cookie is invalid."

I was adding a cookie returned from a web page. The raw header from the web page is:

...
_chartbeat_uuniq=1;
_chartbeat5=321,386,%2F%3Fa%3D1,http%3A%2F%2Fwww.xxx.com%2Fpremium%2Fmoney;
gs_p_GSN-375009-Z=0;
...

What is wrong with the cookie value? Is it the comma?

Answer 1

You should encode the cookie value. The best way is by using UrlEncode. Check this out.

HttpServerUtility.UrlEncode