asp.net mvc - c# object created in main view passed to partial view empty -

c#, .net 4.5, mvc 5

referring xx1 , xx2 below (main view):

the object initialized in main controller. (both header , detial.)

i have added breakpoints @ both xx1 , xx2 confirm that initialized values still there.

• no problem xx1. initialized values there , passed , received controller.
• xx2 have problem. initialized values still there , passed to, null object somehow received by, controller.

why controller detail not pick passed parameters it.

model:

public class samplenonroutine {     public headernonroutine sampleheader { get; set; }     public list<detailnonroutine> sampledetail { get; set; }     public string comments { get; set; } }  public class headernonroutine {     public string division { get; set; }     public string name { get; set; }     public string telephone { get; set; }     [displayname("sample title")]     public string sampletitle { get; set; }     [displayname("retain sample for")]     public int retainsample { get; set; } }  public class detailnonroutine {     public int id { get; set; }     [displayname("sample reference #")]     public string samplereference { get; set; }     [displayname("sample test")]     public string samplestested { get; set; }     [displayname("sample assays")]     public string sampleassays { get; set; } } 

controller:

for parent view

public actionresult nonroutinesamples(string savesend)     {         samplenonroutine sample = new samplenonroutine();         sample.sampleheader = new headernonroutine();         sample.sampledetail = new list<detailnonroutine>();         sample.comments = "toets";          (int = 0; < 10; i++)         {             sample.sampledetail.add(new detailnonroutine { id = + 1, samplereference = "", samplestested = "", sampleassays = "" });         }          return view(sample);     } 

for partial views:

header (partial view):

    public actionresult _headernonroutinesamples(headernonroutine model)     { //...some code         persondetail pdetail = _db.listperson(_meperson.first().number.tostring());         model.name = pdetail.name + " " + pdetail.surname;         model.telephone = pdetail.phonework;         model.division = pdetail.division;         model.retainsample = 30;         return partialview(model);     } 

detail:

    public actionresult _detailnonroutinesamples(list<detailnonroutine> model)     {         return partialview(model);     } 

views:

main

@model laboratorysampleregistration.models.samplenonroutine @{ viewbag.title = "nonroutinesamples"; } @using (html.beginform()) { @html.antiforgerytoken()  <h4>non-routine samples</h4> <table>     <tr>         <td>             @html.action("_headernonroutinesamples", "home", model.sampleheader) xx1         </td>     </tr>     <tr>         <td>             @html.action("_detailnonroutinesamples", "home", model.sampledetail) xx2         </td>     </tr>     <tr>         <td>             <div>                 @html.labelfor(model => model.comments, htmlattributes: new { @class = "control-label col-md-2" })                 <div>                     <span>                         @html.textareafor(model => model.comments, new { @class = "sampleroutinecomments" })                         @html.validationmessagefor(model => model.comments, "", new { @class = "text-danger" })                     </span>                 </div>             </div>         </td>     </tr>     <tr>         <td>             <hr style="border-top:1px solid black !important;" />             <p>                 <input id="savesend" name="savesend" type="submit" value="send laboratory" class="btn btn-default" />             </p>         </td>     </tr> </table> 

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