c# - MVC, Saving Data into 2 or more Related models from a single Form / View .? -

my model: (i) transaction

public class transaction {     [key]     public int transactionid { get; set; }      public datetime onwarddate { get; set; }      public datetime returndate { get; set; }      public virtual userprofile user { get; set; }   } 

(ii) user

public class userprofile {     [key]     [databasegeneratedattribute(databasegeneratedoption.identity)]     public int userid { get; set; }      public string username { get; set; }      private userdetails _details = new userdetails();     public virtual userdetails details     {         { return _details; }     } } 

(ii) userdetails

 public class userdetails {     [key]     public int detailsid { get; set; }      public string dlnum { get; set; }  } 

my controller create transaction:

    // get: /transaction/create      public actionresult create()     {         return view();     }      //     // post: /transaction/create      [httppost]     [validateantiforgerytoken]     public actionresult create(transaction transaction)     {         if (modelstate.isvalid)         {             db.transactions.add(transaction);             db.savechanges();             return redirecttoaction("index");         }          return view(transaction);     } 

my view create transaction:

 <div class="editor-label">         @html.labelfor(model => model.onwarddate)     </div>     <div class="editor-field">         @html.editorfor(model => model.onwarddate)         @html.validationmessagefor(model => model.onwarddate)     </div>     <div class="editor-label">         @html.labelfor(model => model.user.details.dlnum)     </div>     <div class="editor-field">         @html.editorfor(model => model.user.details.dlnum)         @html.validationmessagefor(model => model.user.details.dlnum)     </div> 

when submit form... model.onwarddate getting saved model.user.details.dlnum not saving
hv seen viewmodel. option go it? in advance.

in case, think it's because setter private userdetails:

public virtual userdetails details {     { return _details; } } 

if you're creating tables based on models , therefore can't afford modify them, indeed advise make view model, post using , create / update database entry accordingly.