asp.net validation control for only TEXT input

What validation control would I need if I want the user to enter only TEXT characters in a textbox and what would be t开发者_JAVA技巧he validation expression?

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If you want to use an ASP.NET component to do this, it's the RegEx validator. Plug this in as the expression, it will only allow alpha characters, which is what I assume you mean by TEXT.

^[a-zA-Z]*$