c# - Summernote Asp.net MVC HttpRequestValidationException -

i use summernote enable users write html email on website. email submitted if user submits form. since email little more complex additional data use custom modelbinder leads me problem.

i try email text this

argument = request.form[propertyname] //<-- httprequestbase request; 

the freemessagemodel looks this.

public class freemessagemodel : basemessagemodel {     private mvchtmlstring m_freemessage;     private string m_subject;     private employeemodel m_employee;      public mvchtmlstring freemessage     {                  {             return m_freemessage;          }         set { m_freemessage = value; }     }     public string subject     {         { return m_subject; }         set { m_subject = value; }     }     public employeemodel employee     {         { return m_employee; }         set { m_employee = value; }     }      public string sender      {                  {             string = "someadress");             return from;         }     }      public freemessagemodel()      {     }      public string getmailbody()     {         throw new notimplementedexception();     } } 

the request.form[propertyname] crashes on freemessage error message httprequestvalidationexception. aware html text interpreted possible security issue. question how can text can decide if dangerous myself ?

i read why httprequestvalidationexception submitting user input raw html? happens after modelbinding process.

so question how can html text during modelbinding without getting httprequestvalidationexception , without turning off validation whole application

i using .net framework 4.0