Retrieve the Current App version from Package

Here’s what you can do to retrieve the version in code:

using Windows.ApplicationModel;

public static string GetAppVersion()
{
  Package package = Package.Current;
  PackageId packageId = package.Id;
  PackageVersion version = packageId.Version;

  return string.Format("{0}.{1}.{2}.{3}", version.Major, version.Minor, version.Build, version.Revision);
}

Reference: http://www.michielpost.nl/PostDetail_67.aspx