Casting error question

[C# Programming]

I am using:


foreach (DebtorDataSet.PaymentArrangementsRow row in debtorDataSet.PaymentArrangements.Rows)
{
if (row.PaymentArrangementID != -1 && row.PaymentTypeID == Convert.ToInt32(paymentCategoryComboBox.SelectedItem) && row.ArrangementComplete == false)
{
row.ArrangementComplete = true;
row.ArrangementDate = DateTime.Today;
}
}

but this is giving me the error:
'Unable to cast object of type 'System.Data.DataRowView' to type 'System.IConvertible''
I am not sure how to correct this.

Any help would be much appreciated please.