Asp.net MVC : A potentially dangerous request.form value was detected from the client mvc

While working in mvc I got the below error.

A potentially dangerous Request.Form value was detected from the client

So here is solution for above error. There are multiple ways by which we can prevent the above error.

Way 1 :
On Model property which is used for html content, add the below attribute

[AllowHtml]

 Way 2:
This solution will help to prevent the above by adding attribute at controller end. So on controller action add this attribute to allow all HTML.

[ValidateInput(false)]

 Way 3:
This can be implemented by making in changes in web.config file.

<configuration>     <system.web>         <httpruntime requestvalidationmode="2.0" />     </system.web>     <pages validaterequest="false">     </pages> </configuration>