Receive, Edit and Post an Entity (Framework class) using Webservice

 Can anyone point me to an example of the following scenario?
 Background: I am Serializing an entity class from a webservice as an XmlDocument like below:


             {
             //LINQ Query to get Entity_Object
                 {
                 xmlSerializer.Serialize(memoryStream, Entity_Object);
                    StringBuilder sbXml = new StringBuilder();
                    foreach (byte b in memoryStream.ToArray())
    & ...