解释下这段ASP.NET程序

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
request.Method = WebRequestMethods.Http.Post;
request.ContentLength = data.Length;
request.ContentType = "application/x-www-form-urlencoded";

StreamWriter writer = new StreamWriter(request.GetRequestStream());
writer.Write(data);
writer.Close();

HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string tmp = reader.ReadToEnd();
response.Close();

this.Panel1.GroupingText = tmp;
其中
StreamWriter writer = new StreamWriter(request.GetRequestStream());
writer.Write(data);
writer.Close();实干什么的

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