C# multiple comboboxes

Question

I am writing a program that has two tabs on it. On the first tab the user must enter information about an account(account number, name, address, and phone #). They must also enter investment information(ID,Name,symbol, and shares). Whenever the user clicks on the add customer button, the name of the person goes to a combobox on the second tab. Whenever the user enters information about the investments the name of the investment goes into a listbox on the first tab. The issue I face is that whenever i select an account from the combobox on the second tab, i need an investment combobox to show only the entries for that account and not everysingle one entered while the program has been up. I need to choices from the Investment combobox to be determined by the selection in the customer combobox.

here's the first tab

and here's the second

Answer 1

Hook up a function to the SelectedIndexChanged event of the ComboBox. When it runs, you can fill up the other ComboBox.