In your Create Actions in a Controller in MVC4, if you try to save text with html tags then you get this annoying error.
A potentially dangerous Request.Form value was detected from the client
Description: ASP.NET has detected data in the request that is potentially dangerous because it might include HTML markup or script. The data might represent an attempt to compromise the security of your application, such as a cross-site scripting attack. If this type of input is appropriate in your application, you can include code in a web page to explicitly allow it. For more information, see http://go.microsoft.com/fwlink/?LinkID=212874.
This is a great protection if you do not want your client to save html text.
Here is how to get rid of this error
In the following example we have a create action which saves a new record. MVC4 controller will have two functions.
The first function is for GET ( this is the one which will render the page to save the new record
The second function is for POST. This function is responsible to receive the model
which has been populated by the data which the user has filled in on the form. We have to add the following text
for C# add
‘ GET: /admin/ManageAds/Create
Function Create() As ActionResult
‘ POST: /admin/ManageAds/Create
Function Create(ByVal ad As Ad) As ActionResult
If ModelState.IsValid Then