asp.net mvc - ModelState.IsValid is false - But Which One - Easy Way -

in asp.net mvc, when call post action data, check modelstate , in case validation error, falst. big enter user information form, annoying expand each value , @ count see key (9 in attached example image) has validation error. wondering if knows easy way figure out element causing validation error.

i propose write method:

namespace system.web {     using mvc;      public static class modelstateextensions     {         public static tuple<string, string> getfirsterror(this modelstatedictionary modelstate)         {             if (modelstate.isvalid)             {                 return null;             }              foreach (var key in modelstate.keys)             {                 if (modelstate[key].errors.count != 0)                 {                     return new tuple<string, string>(key, modelstate[key].errors[0].errormessage);                 }             }              return null;         }     } } 

then during debugging open immediate window , enter:

modelstate.getfirsterror()