title: Duplicate HTTP requests from Web Service
body: <p>I am using a SMS web service, which sends me the replies to SMS via HTTP Post (i cant change this)</p>
  
  <p>I catch the replies like this:</p>
  
  <pre><code>            string from = Request.QueryString["from"];
              string message = Request.QueryString["message"];
              string reference = Request.QueryString["ref"];                
              Database.DBLayer db = new Database.DBLayer(App_Code.ConfigClass.ConnectionString);
              db.InsertReply(Convert.ToInt32(reference), from, message);
  </code></pre>
  
  <p>But it seems to intermittently send me duplicates.. Is there a way of checking if the HTTP Request is a duplicate and if it is not actioning it?</p>