How can I add new component with a combo box values into database?

private bool save()
        {
            try
            {
                if (txtMoney != null && txtSubject != null && txtMemo1 != null
                        && txtTitle != null && txtAmount != null && txtMemo2 != null)
                {
                    DateTime date;
                    string division = "";
                    float money;
                    string subject = "";
                    string memo1 = "";
                    string title = "";
                    int amount;
                    string memo2 = "";

                    date = DateTime.Parse(dtDate.Value.ToString());
                    division = cbbDivision.Text.ToString();
                    money = float.Parse(txtMoney.Text.ToString());
                    subject = txtSubject.Text.ToString();
                    memo1 = txtMemo1.Text.ToString();
                    title = txtTitle.Text.ToString();
                    amount = Int32.Parse(txtAmount.Text.ToString());
                    memo2 = txtMemo2.Text.ToString();

                    HanbiDBDataContext db = new HanbiDBDataContext();
                    DataManage data = new DataManage();

                    data.Date = date;
                    data.divId = Int32.Parse(cbbDivision.GetItemText(cbbDivision.SelectedItem));
                    data.Money = money;
                    data.Subject = subject;
                    data.Memo1 = memo1;
                    data.Title = title;
                    data.Amount = amount;
                    data.Memo2 = memo2;

                    db.DataManages.InsertOnSubmit(data);
                    db.SubmitChanges();

                    XtraMessageBox.Show("Add Success!");
                }
                return true;
            }
            catch (Exception)
            {
                XtraMessageBox.Show("Please insert information!", "Warning!", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return false;
            }
        }

CREATE TABLE DataManage
(
	Id int primary key identity (1, 1), 
	[Date] datetime,
	[Subject] varchar(200),
	Title varchar(200),
	[Money] float,
	Memo1 varchar(200),
	Memo2 varchar(200),
	Amount int,
	divId int foreign key references Division(dId)
)

CREATE TABLE Division
(
	dId int primary key identity(1, 1),
	dName varchar(10)
)

private void AddNew_Load(object sender, EventArgs e)
        {
            HanbiDBDataContext db = new HanbiDBDataContext();

            divisionBindingSource.DataSource = db.Divisions.ToList();
        }