Sending HTTP GET commands and Receiving POST commands to/from a remote server

//  generate an AAG GET to retrieve LRU's webpage.  ? Do we follow by receiving a LRU's response (which is a LRU POST)
        string HttpGet (string "/setFreq.shtml")
        {	
            //  generate a request from AAG to LRU server to get the LRU's webpage of selected values
            WebRequest webrequest = WebRequest.Create ("/setFreq.shtml");	// initializes AAG WebRequest instance for URI webpage location on LRU
            webRequest.Method = "GET";										// this sends GET webpage cmd to LRU server
            Stream dataStream = null;										// initialize LRU datastream for GET
            try
            {
                dataStream = webRequest.GetResponse().GetResponseStream();	// request to get datastream from webpages
                StreamReader sr = new StreamReader(datastream);				// reads LRU datastream
                string sLine = "";											// initialize a line of the datastream 
                // read each line of the LRU's datastream until empty
                while (sLine != null)
                {
                    i++;
                    sLine = sr.ReadLine();
                }
                //dataStream.Close();											// close the stream
            }
            catch (WebException ex)											// error reading LRU's datastream
            {	
                MessageBox.Show ( ex.Message, "httpGet:  Request error",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
            }	
        //  read the LRU posted response  ? will this read the LRU's POST to AAG?
            try
            {
                WebResponse webResponse = webRequest.GetResponse();			// assigns response object to LRU's response to AAG's GET WebRequest
                if(webResponse == null)
                { return null; }
                // get the LRU's datastream associated with the response object ? do i use streamreader or stream class to read data?
                StreamReader sr = new StreamReader (webResponse.GetResponseStream());	// reads the LRU's POST response stream
                return sr.ReadToEnd ().Trim ();						// returns read LRU's response to end of data and removes encapsulated white spaces
            }
            catch (WebException ex)											// error reading LRU's response
            {	
                MessageBox.Show ( ex.Message, "httpPost:  Request error",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            return null;	
        }