how to store multiple checked values of checklistbox in a single column of a table and then retrive

if (chklistmembership.CheckedItems.Count > 0)
                    {


                       foreach (var checkedItem in this.chklistmembership.CheckedItems)
                        {
                            cmd.Parameters.AddWithValue("@membership",checkedItem.ToString() );
                                //chklistmembership.SelectedItem.ToString());
                        }
                    }
                    else
                    {
                        cmd.Parameters.AddWithValue("@membership", DBNull.Value);
                    }