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regex - check if a string contains only alphabets c#

How to validate that input string contains only alphabets, validating that textbox contains only alphabets (letter), so here is some of the ways for doing such task. char have a property named isLetter which is for checking if character is a letter or not, or you can check by the regular expression  or you can validate your textbox through regular expression validator in Following code demonstrating the various ways of implementation.

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