how to read xml data into dataset

public void importArchiveListFromXML(string path)
       {
           //Find and see if the file is there
           FileInfo fileInfo = new FileInfo(path);
           if (fileInfo.Exists)
           {
               XmlTextReader reader = new XmlTextReader(string.Format(fileInfo.FullName));
               reader.WhitespaceHandling = WhitespaceHandling.None;
               AddArchiveInfo(reader);
               reader.Close();
           }
       }

public void AddArchiveInfo(XmlTextReader reader)
        {
            XmlNodeType type;
            while (reader.Read())
            {
                type = reader.NodeType;
                if (type == XmlNodeType.Element)
                {
                    if (reader.Name == "Data")
                    {
                        Dataread(reader);
                    }
                }
            }
        }

public void Dataread(XmlTextReader reader)
        {
            fileExtension = new List<string>();
            while (reader.Read())
            {
                if (reader.Name == "ext")
                {
                    reader.Read();
                    fileExtension.Add(reader.Value);
                    reader.Read();
                }
            }
        }