.net - Max file size validation attribute is not working in mvc 4 -

my problem if upload file more 4 mb throwing exception "maximum request length exceeded."

my requirements that: should show validation error message.i not sure whether i'm wrong. please me one

thanks

public class filesizeattribute : validationattribute     {     private long _maxsize;      /// <summary>     /// default constructor. defines maximum size of file.     /// </summary>     public filesizeattribute()     {          _maxsize = convert.toint32(configurationmanager.appsettings["filesize"]);     }      /// <summary>     /// override isvalid method validate decorated property     /// </summary>     /// <param name="value"></param>     /// <returns></returns>     public override bool isvalid(object value)     {         var file = value httppostedfilebase;          if (file == null) return true;          return file.contentlength <= _maxsize;     }      /// <summary>     /// override format message method return failure message.     /// </summary>     /// <param name="name"></param>     /// <returns></returns>     public override string formaterrormessage(string name)     {         return string.format("the file size should not exceed {0} mb", math.ceiling((_maxsize / 1024f) / 1024f));     } } 

property model:

     [filesize]     [filetypes]     public httppostedfilebase file 

in web config file

<httpruntime maxrequestlength="10240" targetframework="4.5" /> 

use maxfilesize in model property directly

[required] [maxfilesize(10 * 1024 , errormessage = "maximum allowed file size {0} bytes")] 

or

see this