Prevent user from entering white space during form input in asp.net model validation?

Question

I have bee using model validation in asp.net MVC website. I want to have a functionality to prevent user from entering whitespace in testbox and submit the form.

The

Answer 1

[RegularExpression(@"[^\s]+")]
public string Data { get; set; }

Answer 2

Use Regex validation with this pattern:

^\S+$

This will allow only non-white-space.

(Update)

If you want users to enter whitespace but only if there are non-whitespace in there:

\S+

Answer 3

This regular expression might work

^[a-zA-Z0-9,-.@~!#$%&*<>?:;_='/()]+(\\s+[a-zA-Z0-9,-.@~!#$%&*<>?:;_='/()]+)*$