Asp. NET background to get cookie Chinese garbled solution

There is a feature in the project that requires the use of a cookie from a page foreground to store the JSON data and pass it to the second page.
To get the JSON value in the cookie in the second page, without any processing, the string is garbled, even the symbols are garbled.
Baidu down, find the following solutions to solve the problem. The records are as follows, for reference:

String json = request.cookies["JSON"= System.Text.Encoding.GetEncoding ("gb2312"= Httputility.urldecode (JSON, ENC);

Asp. NET background to get cookie Chinese garbled solution