Textbox validation to allow only numeric and NA

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i have to do validation for textbox to allow only
numeric and 'NA' in string only. except this not allow to enter any character.
i have to do using c# code.
How can i do this ?

What I have tried:

i dont know how to do this ...

Posted 21-Mar-17 23:17pm

Member 9720862

Updated 21-Mar-17 23:33pm

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Richard MacCutchan · Answer 1 · 2017-03-21T23:33:00

Solution 1

Research: numeric text box c - Google Search[^].

Posted 21-Mar-17 23:33pm

Richard MacCutchan