asp.net - How to Disable non alphabetic characters in Textbox? -

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no, don't mean asp validation controls, i'm looking way "disable" non alphabetic characters, when user presses key not letter(except space), not written in textbox.

i've used ajaxcontroltoolkit's filteredtextboxextender: http://www.asp.net/ajaxlibrary/ajaxcontroltoolkitsamplesite/filteredtextbox/filteredtextbox.aspx


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