C#, Valid ModelState fails .isValid

********************* SEARCH CONTROLLER *************************
    //
    // GET: /Search/Create

    public ActionResult Create()  { return View();  }

    //
    // POST: /Search/Create

    [HttpPost]
    public ActionResult Create(Search search)
    {
      search.Created = DateTime.Now;

      search. SearchSet = "test data";
      search. URLParameter  = 1432567389;
     
    if (ModelState.IsValid)
      {
         _db.Searchs.Add(search);
        _db.SaveChanges();
        return RedirectToAction("Index");
     
      }

     return View(search);
    }

************************* SEARCH CLASS ***********************

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;

namespace TalentProfile.Models
{
  public class Search
  {
    public int Id { get; set; }
      [Required]
    public int URLParameter { get; set; }
      [Required, MaxLength(50, ErrorMessage = "Client must be 50 characters or less")]
    public string Client { get; set; }
      [DataType(DataType.MultilineText), StringLength(150, ErrorMessage = "{0} must be {1} characters or less")]
    public string Notes { get; set; }
      [Required]
    public string SearchSet { get; set; }
      [Required]
    public DateTime Created { get; set; }
  }
}

If I run in debug all the fields in the class are properly set but it fails ModelState.isValid.  If I drill into the ModelState.isValid it is false.  Drilling down further I find the error “The SearchSet field is required”.
The SearchSet field is properly set to “test data”.  If I remove the ModelState.isValid check the save to the database succeeds.

Why am I getting the “field is required” error if the field contains valid data.

Thanks,

Bob


****** Updated Search Controller  and Create View ***************

//
// GET: /Search/Create

public ActionResult Create()
{
Search search = new Search();
search.SearchSet = "test Data";
return View(search); }

//
// POST: /Search/Create

[HttpPost]
public ActionResult Create(Search search)
{
search.Created = DateTime.Now;

search.URLParameter = 1435267836;

if (ModelState.IsValid)
{
_db.Searchs.Add(search);
_db.SaveChanges();
return RedirectToAction("Index");
}
return View(search);
}



In view put:  @Html.HiddenFor(model => model.SearchSet)
BobmummAsked:
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BobmummAuthor Commented:
When the form is posted back to the POST action a Search object is created.  Created and URLParameter are DateTime and int fields are non-nullable and are set to 01/01/0001 and 0 by default.  SearchSet is a string whose default is null, thus the ModelState fails on SearchSet.  Drilling down into ModleState shows that it only checks the string fields (Client, Notes and SearchSet), Client and Notes are set in the view.  This is why you can set the DateTime and int but not the string fields in the POST action.  Passing the view a Search object with the SearchSet field set to a non-null value in the GET action and then exposing SearchSet with a @Html.HiddenFor  resolves the problem.  See updated post with the revised code.
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