Ok, let me explain my problem with using the drop down event. I took out the code which resets the selected index, and am only left with:

transactionTableAdapter.FillBy(_dtTransactions);

What it is doing is selecting the 0 index of the combobox after the table adapter fills the table which is used as the data source, thus not showing the drop down box for users to choose a value. Basically forcing the index 0 to be selected...

Any ideas on why this is happening?

Thanks,

Brandon