SF_10.1, SF_10.2, SF_11.0, SF_11.1, SF_11.2, SF_12.0, SF_12.1, SF_12.2, SF_13.0, SF_13.1, SF_13.2, SF_13.3, SF_14.0, SF_14.1, SF_14.2, SF_14.3 - https://docs.sitefinity.com/for-developers-get-the-default-location-of-an-item

GetItemDefaultLocation.cs

using Telerik.Sitefinity.News.Model;
using Telerik.Sitefinity.Services;

namespace Telerik.Sitefinity.Documentation.CodeSnippets.DevGuide.HowTo.ContentLocationsAPI
{
    public partial class ContentLocationsAPI
    {
        public static string GetItemDefaultLocation(NewsItem item)
        {
            //first we need to get an instance of the location service
            var clService = SystemManager.GetContentLocationService();

            //gets the item default location of a given news item
            var location = clService.GetItemDefaultLocation(item);

            //gets the absolute url for the location
            if (location != null)
                return location.ItemAbsoluteUrl;

            return string.Empty;
        }
    }
}