ASP. MVC4 (Razor) detects potentially dangerous request.form values from the client

Description: The request verification process detected a potentially dangerous client input value and the processing of the request has been aborted.

This value may indicate an attempt to compromise application security, such as a cross-site scripting attack. To allow the page rewrite application to request validation settings,
Set the Requestvalidationmode attribute in the HttpRuntime configuration section to requestvalidationmode= "2.0".
Example: For more information, see http://go.microsoft.com/fwlink/?LinkId=153133.
Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous request.form value was detected from the client (myname= "<p>test</p>").
If you must enter content with markup, the workaround:
1. Modify the Web. config

< system.web > ..... <  requestvalidationmode= "2.0"/></system.web  >

2. Add [ValidateInput (false)] to the controller
For example:

[ValidateInput (false)]  Public ActionResult Noticeadd () {...}

ASP. MVC4 (Razor) detects potentially dangerous request.form values from the client