title: Sitecore Analytics Tracker CurrentVisit data getting reset (C#, ASP.Net)
body: <p>I'm using <code>Sitecore.Analytics.Tracker</code> for personalizations on my site. I have added the ability for the user to manually change their zipcode, which changes what they see on certain parts of the site. The zipcode is retrieved with <code>Tracker.CurrentVisit.PostalCode</code></p>
  
  <pre><code>public string GetCurrentZipCode()
  {
      return Tracker.CurrentVisit.PostalCode.IsNotNullOrEmpty() ? Tracker.CurrentVisit.PostalCode : String.Empty;
  }
  
  public void SetCurrentZipCode(string zip)
  {
      Tracker.CurrentVisit.PostalCode = zip;
  
  }
  </code></pre>
  
  <p>This works but is finicky; every now and then when I reload the page, the zip code will have changed back to the default, which I discovered is because sometimes when the page loads PostalCode has changed back to an empty string. </p>
  
  <p>Why is <code>Tracker.CurrentVisit.PostalCode</code> getting reset? Is this a setting in Sitecore? How can I stop it? Ideally the value of PostalCode should persist for the entire session.</p>