A potentially dangerous Request.Form value was detected from the client (textboxError=”

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Your problem is that the value of one of your fields (textboxError) includes XML- or HTML-style tags, which by default are disallowed to avoid developers introducing potential security issues within their applications.

The solution is given in the error message; you need to add validateRequest="false" in either the @Page directive at the top (omitted in your sample) or in web.config.

Note that if you’re using .net 4, you need to drop back to the validation mode from 2.0, by altering web.config slightly and adding:

<system.web>
    <httpRuntime requestValidationMode="2.0" />
</system.web>

See this MSDN article on requestValidationMode for more information on requestValidationMode.

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