c.net COOKIES setup tips on the WEB page

1. The method of setting cookies is very simple. There are two ways:

1. Directly add Cookie value:
Response.Cookies["userName"] = "Tom";
"userName" Response. Cookies [] Expires = DateTime. Now. AddDays (1); \\ expiration time, cannot be viewed or called in Cookies file.

2. Create an instance of Cookie object:
HttpCookie cookie=new HttpCookie("userName");
cookie.Value = "Tom";
cookie.Expires = DateTime.Now.AddDays(1) ;
Response.Cookies.Add(aCookie)

Use any of the 1 methods to generate a file with the "userName" entry, which you can view in your Internet temporary folder.

You can also create and add Cookies with child keys, such as:
Response.Cookies["userInfo"]["userName"] = "Tom";

Or:
HttpCookie cookie=new HttpCookie("userInfo");
cookie.Values["userName"] = "Tom";
aCookie.Expires = DateTime.Now.AddDays(1);
Response.Cookies.Add(aCookie)

2. Retrieve Cookies:
The value of Cookies 1 key is:
Server.HtmlEncode(Request.Cookies["userInfo"]["userName"])
You can output it to the page using the Response.Write () method, such as:
Response. Write (Server HtmlEncode (Request Cookies [" userInfo "] [" userName "]));

Or assign values to other variables:

string strCookie1=Server.HtmlEncode(Request.Cookies["userInfo"]["userName"]);

All items and subkeys can be retrieved with the Cookies[i] array, such as:

 
string[] cooName = new string[Request.Cookies.Count]; 
string[] cooValue = new string[Request.Cookies.Count]; 
HttpCookie aCookie; 
for(int i=0;i<Request.Cookies.Count;i++){ 
aCookie = Request.Cookies[i]; 
cooName[i] = Server.HtmlEncode(aCookie.Name); 
if(!aCookie.HasKeys){ 
cooValue[i] = Server.HtmlEncode(aCookie.Value); 
}else{ 
string[] subcooName = new string[aCookie.Values.Count]; 
string[] subcooValue = new string[aCookie.Values.Count]; 
for(int j=0;j<aCookie.Values.Count;j++){ 
subcooName[j] = Server.HtmlEncode(aCookie.Values.AllKeys[j]); 
subcooValue[j] = Server.HtmlEncode(aCookie.Values[j]); 
} 
} 
} 

3. Modify Cookies
If it is a numeric Cookie value, such as the number of visits, you can read it, add or subtract it, and then save it back. The 1-like modification can be directly saved into the new value.

4. Delete Cookies
To delete Cookies, just set the expiration date as invalid. For example, set the expiration date as 1 day when creating:
cookie.Expires = DateTime.Now.AddDays(1) ;
To delete, set as:
cookie.Expires = DateTime.Now.AddDays(-1) ;

Delete child key:

 
HttpCookie cookie; 
cookie = Request.Cookies["userInfo"]; 
aCookie.Values.Remove("userName"); 
aCookie.Expires = DateTime.Now.AddDays(1); 
Response.Cookies.Add(aCookie);