The client detected a potentially dangerous request. form value with a string such as JavaScript during the recent request.

The client detects potentially dangerous request. Form values. Reasons and Solutions
The client detects potentially dangerous request. Form values. Causes and Solutions
Cause: When a page request contains a string such as HTML or Javascript. ASP. NET considers it a dangerous value and throws a resignation exception. This exception occurs when the WYSIWYG editor (for example, the FCKeditor or freetextbox control) is used on the page.

Solution 1: Add <% PAGE validaterequest = "false" %> to the page.

Solution 2: Modify the <pages> label of the web. config configuration file. <Pages validaterequest = "false">... </pages>. This method removes all page verification functions, so this method is not recommended.

Solution 3: capture exceptions so that you can define the exception prompts by yourself.

Protected void page_error (Object sender, eventargs E)
{
Exception EX = server. getlasterror ();
If (httpcontext. Current. server. getlasterror () is httprequestvalidationexception)
{
Httpcontext. Current. response. Write ("Enter the exception information to be prompted ");
Httpcontext. Current. clearerror ();
}
}