Textbox only allow letter....... Show the code in C# text only allow alphanumeric same in C#

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textbox only allow letter....... show the code in c#
text only allow alphanumeric same in c#

What I have tried:

just tell me the code in c#asp.net

Posted 13-Jul-16 21:11pm

Member 12634216

Updated 13-Jul-16 21:45pm

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Suvendu Shekhar Giri 14-Jul-16 3:25am

Is it a windows application or web application?
What have you tried so far?

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CPallini · Answer 1 · 2016-07-13T21:35:00

Solution 1

Google is your friend. See for instance c# - How do I make a textbox that only accepts numbers? - Stack Overflow[^]. While not exactly solving your problem, the first answer illustrates the technique.

Posted 13-Jul-16 21:35pm

CPallini

OriginalGriff · Answer 2 · 2016-07-13T21:45:00

For ASP.NET you don't want to do it in C# - you want to do it in JavaScript so that the user can't enter "bad" info. Doing it in C# means a round trip to the server either when the user is finished with the whole form, or for each character. The former is a pain for the user as they get told at the end "that was wrong" and have to go back to fix it, the latter is slow and awkward. Using JS means it's done at the client end and the server isn't involved.
Javascript validation: Validate TextBox using JavaScript[^]