<system.web>
<globalization requestEncoding="gb2312" responseEncoding="gb2312" culture="zh-CN" fileEncoding="gb2312" />
</system.web>

string Name = "中文参数";
Response.Redirect("B.aspx"+Server.UrlEncode(Name)) ;

string Name = Request.QueryString["Name"];
Response.Write(Server.UrlDecode(Name)) ;

function GoUrl(){
var Name = "中文参数";
location.href = "B.aspx"+escape(Name) ;
}

string Name = Request.QueryString["Name"];
Response.Write(Server.UrlDecode(Name)) ;

Response.Redirect("test1.aspx"+System.Web.HttpUtility.UrlEncode("中华人明共和国")) ;
//建议使用最后如果是从其他的页面获取中文参数没有乱码，那就更简单了
string message ="http://localhost/Test/test1.aspx"+System.Web.HttpUtility.UrlEncode("中华人明共和国");

//你要获取某个页面的返回值的地址"
//发送请求
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(message) ;
//接受请求
HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse() ;
Stream receiveStream = myHttpWebResponse.GetResponseStream() ;
StreamReader readStream = new StreamReader(receiveStream, System.Text.Encoding.GetEncoding("GB2312")) ;
//此为要取页面的返回值输出的返回结果
returnValue = readStream.ReadToEnd();