Asp.net error message (potentially dangerous request. form detected)

During Asp.net development, data is sent back to the backend server (for example, textbox and webhtmledit ). if the returned data contains some special answers, it will be reported during running:
Potentially dangerous request. Form Detected
Solution
1. Add the following sentence to the Web. config file <system. Web>: <pages validaterequest = "false"/>
Example:
<? XML version = "1.0" encoding = "gb2312"?>
<Configuration>
<System. Web>
<Pages validaterequest = "false"/>
</System. Web>
</Configuration>

2. Add validaterequest = "false" to the page of *. aspx file header. The example is as follows:
<% @ Page validaterequest = "false" %>