What is the meaning of A potentially dangerous Request.Form value was detected from the client  error message
<p>I was trying to send an email via my web project using <a href="http://freetextbox.com/" rel="nofollow">Free text box</a> control.It is an text editor . but I've got this error.</p>

<p><strong>A potentially dangerous Request.Form value was detected from the client (FreeTextBox1="<b>hello my dear</b>").</strong>
I set the ValidateRequest=false  and I set the isbodyHtml=true. but It doesn't work .</p>

<p>what should I do?</p>
