Hi, I have a combobox, textbox, listbox, and a save button. Combobox is filled with illness names stored from database. Every illness that will be selected from the combobox, its symptoms will be listed in the listbox. When a symptom is typed in the textbox and save button is clicked, the selected value from the combobox and the new symptom typed from the textbox will be saved in the database and the newly typed symptom should be added in the listbox..but I can't add the item from textbox to listbox. I already tried lstIllness.Item s.Add(textbox1. text) but got an error, it says 'Items collection cannot be modified when the data source property is set'. Please help me. Thanks
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