ASP.NET 3.5 Store multiple selection from CheckBoxList to database

public partial class WhateverYourClassNameIs
{
  public String[] Selections //<-- change this to private if not being accessed to other classes.
  {
    get
    {
      string[] sl = s.Split("$");
      foreach (string  s in sl)
      {
        ListItem itm = CheckBoxList1.Items.FindByValue(s);
        if (itm != null) itm.Selected = true;
      }
    }
    set
    {
      string s = string.Empty;
      foreach (ListItem  itm in CheckBoxList1.Items)
      {
        if (itm.Selected)
        {
          s += itm.Value + "$";
        }
      }
    }
  }
}