inheritance - C# explicit cast superclass to derived class and get specific variables -

i have abstract class, tile. have class, webtile, inheriting tile-class. webtile have private string html, tile not have.

 public abstract class tile {     private string name;     private string description;      public string name     {         { return name; }     }      public string description     {         { return description; }     }      protected tile(string name, string description)     {         this.name = name;         this.description = description;     } }   public class webtile : tile     {         private string html;         public string html         {             { return html; }         }         public webtile(string name, string description, string html) : base(name, description)         {             this.html = html;         }     } 

i have method returns list of tiles (list<tile>)

i loop through list, , cast tiles of type webtile webtile.

and want html-string. has become empty after cast?! missing?

foreach (tile tile in xmlparser.gettiles())             {                 switch (tile.gettype().tostring())                 {                     case "dashboard.tiles.webtile":                         webtile _tile = tile webtile;                         sb.append("<div class=\"panel panel-default\">");                         sb.append("<div class=\"panel-heading\">" + _tile.name + "</div>");                         sb.append("<div class=\"panel-body\">");                         sb.append(_tile.html); // <--- empty!!                         sb.append("</div>").append("</div>");                         break;                     default:                         break;                 }              } 

public class webtile : tile     {         private string html;         public string html         {             { return html; }         }         public webtile(string name, string description, string html) : base(name, description)         {          //wronge          // this.html = html;          //correct          this.html = html;         }     }