StreamReader into DataTable

I want to read atom xml, and used following code

string str1 = "http://moss:133333/_vti_bin/ExcelRest.aspx/Document Library/http://ift.tt/1zZ5M82";

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(str1);
req.UseDefaultCredentials = true;
req.PreAuthenticate = true;
req.Credentials = CredentialCache.DefaultCredentials;
req.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)";

WebResponse response = req.GetResponse();              

Encoding enc = System.Text.Encoding.GetEncoding(1252);
StreamReader loResponseStream = new StreamReader(response.GetResponseStream(), enc);
string Response = loResponseStream.ReadToEnd();

The last line in above code basically reads whole stream reader into the string Response.

Now I do not know how do I read the above string's atom xml into the data table please help urgently