Tips from the old school. Handling the beep in a Windows TextBox for Enter key. On July 8, 2010 by christophermelvin. There are times when you want to find out when the user presses the enter key inside a specific text box, then perform some action. Multiline Windows sounds its annoying beep to tell the user they did something wrong. And, if the text box. 2 Check the KeyChar for the Enter key.

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