There is no predefined control to evaluate minimum length. There are two
solutions available though:
1. Use a RegularExpressionValidator with this expression:
^[\s\S]{5, maximum value}$
2. My Professional Validation And More
(http://www.peterblum.com/vam/home.aspx) includes a TextLengthValidator that
handles min and max lengths. Its improved over the regex because its faster
(it checks the text length instead of running a regular expression) and its
error message can show the current text length and the current number of
character below the minimum or above the maximum.
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