Refering to Items in a List Box that objects

private void btnServiceSave_Click(object sender, EventArgs e)
        {
            //Populate Service Types Combo Box
            string commandString =
                "SELECT AccountNo, ServiceNo,LinkNo, ContractStart, ContractEnd " +
                "FROM dbo.TAS_ServicesTemp " +
                "WHERE AccountNo IS NULL ";
 
 
            // create the data set command object
            // and the DataSet
            DataAdapter = new SqlDataAdapter(commandString, ConnectString);
            DataSet = new DataSet();
            // fill the data set object
            DataAdapter.Fill(DataSet, "TempServices");
            // Get the one table from the DataSet
            DataTable = DataSet.Tables["TempServices"];
 
 
             // create a new row, populate it
            for (int indexNo = 2; indexNo < lstBxServices.Items.Count;  indexNo++)
            {      
                Item ServiceItem =  (Item) lstBxServices.Items[indexNo];
                DataRow newRow = DataTable.NewRow();
                newRow["AccountNo"] = 2;
                newRow["LinkNo"] = 5;
                newRow["ServiceNo"] = ServiceItem.ServiceNo;
                newRow["ContractStart"] = ServiceItem.ContractStart;
                newRow["ContractEnd"] = ServiceItem.ContractEnd;
                DataTable.Rows.Add(newRow);
            }
            
            // update the db
            DataAdapter.Update(DataSet, "TempServices");
            // inform the user and accept the changes
            //lblMessage.Text = DataAdapter.UpdateCommand.CommandText;
            Application.DoEvents();
            DataSet.AcceptChanges();
 
        }
private class Item
        {
 
            public int ServiceNo;
            public string ServiceDescription;
            public string ContractStart;
            public string ContractEnd;
            public string Charge;
            public Item(string Description, int No, string Start, string End, string Charge)
            {
                ServiceNo = No;
                ServiceDescription = Description;
                ContractStart = Start;
                ContractEnd = End;
                this.Charge = Charge;
            }
            public override string ToString()
            {
                return ServiceDescription;
            }
            public string ToString(Boolean Full)
            {
                if (Full)
                    return ServiceNo + "  " + ServiceDescription + "  " + ContractStart + "  " + ContractEnd + "  " + "R" +Charge;
                else
                    return ServiceDescription;
            }
        }