What is this? (auto drop-down) [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its curr开发者_JAVA技巧ent form. For help clarifying this question so that it can be reopened, visit the help center. Closed 11 years ago.

I store a list of names in a text file. When I enter any single character on a text boc position on the main form, I need a small window to display and list the term I may choose to fill in. I don't what this is called to search the iNternet if there exists a similar source code for me to use.

Thank you.

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