How to transfer the ISO - 8859-1 in Chinese-CodePudding

File information, found that Chinese name of the file, will appear garbled,
Find the CharacterSet _httpWebResponse is ISO - 8859-1 ,
Chinese have become garbled, don't know how to convert the utf-8 or GB2312

 
HttpWebRequest _httpWebRequest=(HttpWebRequest) HttpWebRequest. Create (Url); 
_httpWebRequest. Headers. The Add (Translate: "f"); 
_httpWebRequest. Credentials=CredentialCache. DefaultCredentials; 
_httpWebRequest. Method="PROPFIND"; 
_httpWebRequest. Headers. The Add (" the Depth: infinity "); 
HttpWebResponse _httpWebResponse=(HttpWebResponse) _httpWebRequest. The method GetResponse (); 
StreamReader _streamReader=new StreamReader (_httpWebResponse GetResponseStream (), Encoding, GetEncoding (" utf-8 "));