The potentially dangerous Request.Form value was detected on the MVC4 client

Question

I get this error when inserting a record with the character "<".

how to solve this error by inserting a line with "<" in this. im using an entity structure. this column is of the nvarchar data type.

early.

Answer 1

You can try setting the requestValidationMode="2.0" attribute in the <httpRuntime /> element in web.config

 <system.web> ... <httpRuntime targetFramework="4.5" requestValidationMode="2.0" /> ... </system.web> 

And decorate your controller / action (choose the appropriate one):

 [HttpPost] [ValidateInput(false)] public ActionResult MyMethod(string s) { .... } 

Note. Always sanitize your entrance.

Answer 2

In addition to what @scheien has already suggested, you can check to see if you are setting the input (with a potentially dangerous script ie <character) to some model value that does not accept it. Try to do this:

 [AllowHtml] public string text{ get; set;}