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ASP.net field validation

How do you avoid a user entering more then one word into a text box in asp.net?  Let's say that they can only list 1 word or combination of words but there can be no character spaces between each word?  How would you handle this in ASP.NET?  Thanks!
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2 Solutions
You could add this to your textbox -

onKeyDown="return (event.keyCode!=32);"

As in-

<asp:TextBox ID="CountIDTextBox" runat="server" onKeyDown="return (event.keyCode!=32);"></asp:TextBox>

And then no spaces can be typed into that textbox.
VBBRettAuthor Commented:
Is this C# code or a script?
That's javascript, but it works perfectly in an asp page as per the example.

You can also use onKeyDown="return (event.keyCode!=13);" which will disable the enter key to prevent accidental postback if someone hits the enter key in a textbox.
Obadiah ChristopherCommented:
Does this work cross browser?
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