[A-Za-z\.\s] +

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John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

Hehe, a little improvement

[A-Za-z\. ] +

1 if \r \n \t would not appear in a text box, then a space would be enough
2 if at least one character, a + needed.

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www.wonderstudio.cn

Yes, thank you!

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John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

you can Add those charechters to an array.
on keydown event you can check the charachter typed in your textbox,
if your charachter is not in array ,set :
e.handeled = false;

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Pishkari

In ASP.NET, you will probably use the RegularExpressionValidator control, bound to your TextBox control. Look up the MSDN usage for more detail. You can use the Regular Expression patterns suggested above. My only additional input is that the RegularExpressionValidator control will treat an empty textbox as valid input (regardless of the pattern used). So, if you don't want to allow an empty input, you will need to test on either the client or server side for that condition. Other than that, the RegularExpressionValidator will do a nice job.

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Les Potter, Xalnix Corporation, Yet Another C# Blog