如何为winforms文本框实现类似intellisense的建议框？

We have a textbox that the user enters sets of terms into, delimited by commas and separated by newlines. There may be thousands of valid terms, so we'd like to offer the user intellisense-style suggestions as they type. The default autocomplete isn't adequate because it will only do prefix-matching on the entire textbox, and won't support multiline textboxes. How do I implement intellisense-like suggestion boxes for a winforms textbox?We have a textbox that the user enters sets of