private void SubmitCheck( IDataProvider provider )
{
int accountId = int.Parse( ddlAccount.SelectedValue );
IAccount account = provider.GetAccount( accountId );
if( account == null )
throw new ApplicationException( "Account " + accountId + " not found in data storage." );
IAccount expenseAccount = provider.GetAccount( 2 );
if( expenseAccount == null )
throw new ApplicationException( "Expense account not found in data storage." );
this.trans = provider.NewTransaction();
trans.Amount = Convert.ToDecimal( txtAmount.Text );
trans.TransactionDate = DateTime.Parse( txtDate.Text );
trans.Payee = txtPayee.Text;
if( txtMemo.Text.Length > 0 ) trans.Memo = txtMemo.Text;
trans.IsEstimated = chkEstimated.Checked;
ILineItem credit = trans.NewLineItem();
credit.SetAccount( account );
credit.Amount = trans.Amount;
credit.Category = null;
credit.Memo = trans.Memo;
if( txtNumber.Text.Length > 0 ) credit.Number = txtNumber.Text;
credit.TransactionType = TransactionType.Credit;
credit.IsTaxRelated = this.chkDeductible.Checked;
ILineItem debit = trans.NewLineItem();
debit.SetAccount( expenseAccount );
debit.Amount = credit.Amount;
debit.Category = txtCategory.Text;
debit.TransactionType = TransactionType.Debit;
debit.IsTaxRelated = this.chkDeductible.Checked;
}