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You can follow the thread below: Let me know if this does not help. The legal string list can be loaded before the user type in the TextBox. An uppercase 'A' is reported as 65 by all events. For example, a lowercase 'a' will be reported as 65 by keydown and keyup, but as 97 by keypress.
#USING PROMISES WITH KEYUP FOR FORMS CODE#
The keydown and keyup events provide a code indicating which key is pressed, while keypress indicates which character was entered. If it is illegal, set the Handled property of the event argument to true to prevent the input. The keyup event is fired when a key is released. You can handle the KeyPress event to check if the typed text. Forbid the user typing in the character if the result text is illegal. You can follow the thread below which contains a sample: 2. If the typed text is not in the list, the drop down list will be empty. You should also prevent double submit in the application backend (many web frameworks have built-in mechanism for doing this, it easy to come up with custom solution as well). This would prevent accidental double click. Guide the user to type in the correct database string: You can set AutoCompleteMode and AutoCompleteSource properties to show a hint list under the TextBox. Add boolean variable that would be set to true after first submit and use that variable in your if condition. Hi Alex, From your description, your requirement is one of the below: 1. "Sweet are the uses of adversity, Which like the toad, ugly and venomous, Wears yet a precious jewel in his head And this our life, exempt from public haunt, Finds tongues in trees, Books in the running brooks, Sermons in stones, and good in everything" - William Shakespeare Void searchTB_KeyUp(object sender, KeyEventArgs e) MessageBox.Show(string.Format("Search Database for '' Here.", s)) Void regulatorTimer_Tick(object sender, EventArgs e) RegulatorTimer.Tick += new EventHandler(regulatorTimer_Tick) SearchTB.KeyUp += new KeyEventHandler(searchTB_KeyUp)
I got now, you can do it by Timer component like followingĬonst int SEARCH_PERIOD = 2000 //specify your own period here (defualt is 2 seconds)
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