ComboBox and 2D Array

public class ComboBoxItem{
   private string entry;
   private string tag;

   public ComboBoxItem(string entry, string tag){
       this.entry = entry;
       this.tag=tag;
   }

   public string Entry{
      get{
         return this.entry;
     }
   }

   public string Tag{
       get{
         return this.tag;
      }
   }
    public override string ToString(){
       return entry;
    }
}

Important is the ToString() Method, because the result will be shown in the comboBox.

Do you understand the idea?