System.Collections.ArrayList al = new System.Collections.ArrayList();
 for(int i=0; i<5; i++){
       DataClass dc = new DataClass();
       dc.ID = i;
       dc.Description = "Collection Item " + i;
       al.Add(dc);
 }
 this.ListBox1.DataSource = al;
 this.ListBox1.DataTextField = "Description";
 this.ListBox1.DataValueField = "ID";
 this.ListBox1.DataBind();

 class DataClass{
       public string Description{
              get{return description;}
              set{description = value;}
       }
       public int ID{
              get{return id;}
              set{id = value;}
       }
       private string description;
       private int id;
 }