Sitecore- Some basic operations

 //Operation # 1   /// Basic operations get userName
            var str = "Start";
            var listA = Sitecore.Context.GetUserName();
           
            // Result will be like extranet\Anonymous

           //Operation # 2   /// Get all items
            var list = Sitecore.Context.Database.Items["/sitecore/content/Jack/Our Team"];

            foreach (Item subitem in list.Children)
            {
                str = str + subitem.Name;
            }
           
            testDiv.InnerText = Convert.ToString(str);