Question

How can add/remove/replace LIST in cookies using C#.

//Declaring the List for image list

List<string> imageList = new List<string>();
foreach (FeaturedPromo promo in base.FeaturedPromos)
{
    imageList.Add(promo.ImageHref);
}

In above code, I have got a list with all the Image HREF values in it, Now I want to add these values in cookies using C#, after that I can remove that item from cookies and also replace the value with other value of same item in cookies.

Please suggest!

Answer 1

Cookies are not removed they are just overwritten or expired (sometimes forced to expire).

To add it to cookies just create a Cookie Name Value collection and add each item from list to the Collection.

Example to add a list of items to cookies:

System.Collections.Specialized.NameValueCollection cookiecoll = new System.Collections.Specialized.NameValueCollection();
for(int i = 0 ; i < imageList.Length; i++)
{
    cookiecoll.Add("item_" + i,imageList[i] );
}

HttpCookie cookielist = new HttpCookie("MyListOfCookies");
cookielist.Values.Add(cookiecoll);
Response.Cookies.Add(cookielist);

Example To Edit “item_2”

 Response.Cookies["MyListofCookies"].Values["item_3"] = "new value";

Example to delete cookies:

Response.Cookies["MyListOfCookies"].Expires = DateTime.Now.AddDays(-1);

Example to delete a single item from list (just overwrite with nothing )

Response.Cookies["MyListOfCookies"].Values["item_3"] = String.Empty;

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Note: But remember you can’t add too much data in cookies.. many browsers have a upper limit to the size and number of cookies you can store.