private async Task FillCollectables()
        {
            lstCollectables.Items.Clear();
            IEnumerable <ILoanModel> _loans = await loans.GetAll();

            IEnumerable <CollectablesModel> _collectables = await cols.GetAll();

            var collectables = _loans.Join(_collectables, l => l.LoanId, b => b.Loan.LoanId,
                                           (l, b) => new {
                l.LoanId, b.Borrower.FullName, l.PerRemittance, l.PaymentTerm, b.Loan.Collector, l.TotalBalance
            }).Distinct();


            if (cboCollector.SelectedIndex != -1)
            {
                UserModel user = (UserModel)cboCollector.SelectedItem;
                collectables = collectables.Where(col => col.Collector == user.Name);
            }

            if (textBox1.Text.Trim() != "")
            {
                try
                {
                    collectables = collectables.Where(col => col.FullName.ToUpper().Contains(textBox1.Text.ToUpper()));
                }
                catch (Exception)
                {
                    MessageBox.Show("Failed to find the borrower! Please Try Again.");
                }
            }


            lblTotal.Text = CalculateCollectibles(collectables).ToString("c");
            FillListView(collectables);
        }