Adnan’s Blog

Multiline TextBox Length Validation

Posted on: January 10, 2009

Unlike the normal TextBox, the MaxLength property doesnt work for MultiLine TextBox. Heres a small trick to solve the problem:

<asp:TextBox ID="txtExample" runat="server" TextMode="MultiLine" />
<asp:RegularExpressionValidator ID="revExample" runat="server" 
ControlToValidate="txtExample" ValidationExpression="[\s\S]{1,200}" 
Display="Dynamic" ErrorMessage="Length cannot be greater than 200 characters" />

The above markup validates the revExample TextBox / textarea and limits the max characters to 200. By modifying the regular expressions, we can validate fields for any scenario. If you are looking for some Regular Expressions to get started out, just point your browser to



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