colModel: [
                    {
                        name: 'Name', index: 'Name', align: 'right', width: 200,
                        search: true, stype: 'text', searchoptions: { sopt: searchOptions }
                    },
                    {
                        name: 'Supplier.Id', index: 'Supplier.Id', align: 'right', width: 200,
                        search: true, stype: 'select', edittype: 'select', searchOperators: true,
                        searchoptions:
                        {
                            sopt: searchOptions, dataUrl: '@Url.Action("SuppliersSelect","Home")'
                        }
                    }
                ],

 var searchOptions = ['eq', 'ne', 'lt', 'le', 'gt', 'ge', 'bw', 'bn', 'in', 'ni', 'ew', 'en', 'cn', 'nc'];

        public ActionResult SuppliersSelect()
        {
            var list = ProductDataSource.LatestProducts;
            var suppliers = list.Select(x => new SelectListItem
            {
                Text = x.Supplier.CompanyName,
                Value = x.Supplier.Id.ToString(CultureInfo.InvariantCulture)
            }).ToList();
            return PartialView("_SelectPartial", suppliers);
        }

 @model IList<SelectListItem>

@Html.DropDownList("srch", Model)

        $(document).ready(function () {
            $('#list').jqGrid({
              // ... مانند قبل و توضیحات فوق
            })
            .jqGrid('navGrid', '#pager',
                { add: false, edit: false, del: false },
                {},  // default settings for edit
                {},  // default settings for add
                {},  // delete instead that del:false we need this
                {
                    // search options
                    multipleSearch: true,
                    closeOnEscape: true,
                    closeAfterSearch: true,
                    ignoreCase: true
                })
            .jqGrid('navButtonAdd', "#pager", {
                caption: "نوار ابزار جستجو", title: "Search Toolbar", buttonicon: 'ui-icon-search',
                onClickButton: function () {
                    toolbarSearching();
                }
            });
        });
        

        function toolbarSearching() {
            $('#list').filterToolbar({
                groupOp: 'OR',
                defaultSearch: "cn",
                autosearch: true,
                searchOnEnter: true,
                searchOperators: true, // فعال سازی منوی اپراتورها
                stringResult : true // وجود این سطر سبب می‌شود تا اپراتورها به سرور ارسال شوند
            });
        };

        function singleSearching() {
            $('#list').searchGrid({
                closeAfterSearch: true
            });
        };

        function advancedSearching() {
            $('#list').searchGrid({
                multipleSearch: true,
                closeAfterSearch: true
            });
        };

/* align center search popup in jqgrid */
.ui-jqdialog {
    display: none;
    width: 300px;
    position: absolute;
    padding: .2em;
    font-size: 11px;
    overflow: visible;
    left: 30% !important;
    top: 40% !important;
}

 //single field search
//_search=true&nd=1403935889318&rows=10&page=1&sidx=Id&sord=asc&searchField=Id&searchString=4444&searchOper=eq&filters=

//multi-field search
//_search=true&nd=1403935941367&rows=10&page=1&sidx=Id&sord=asc&filters=%7B%22groupOp%22%3A%22AND%22%2C%22rules%22%3A%5B%7B%22field%22%3A%22Id%22%2C%22op%22%3A%22eq%22%2C%22data%22%3A%2244%22%7D%2C%7B%22field%22%3A%22SupplierID%22%2C%22op%22%3A%22eq%22%2C%22data%22%3A%221%22%7D%5D%7D&searchField=&searchString=&searchOper=
// filters -> {"groupOp":"AND","rules":[{"field":"All","op":"cn","data":"fffff"},{"field":"Price","op":"bn","data":"ffff"}]}

//toolbar search
//_search=true&nd=1403935593036&rows=10&page=1&sidx=Id&sord=asc&Id=2&Name=333&SupplierID=1&CategoryID=1&Price=44

        { "groupOp": "AND",
              "groups" : [ 
                { "groupOp": "OR",
                    "rules": [
                        { "field": "name", "op": "eq", "data": "England" }, 
                        { "field": "id", "op": "le", "data": "5"}
                     ]
                } 
              ],
              "rules": [
                { "field": "name", "op": "eq", "data": "Romania" }, 
                { "field": "id", "op": "le", "data": "1"}
              ]
        }

    public class SearchFilter
    {
        public string groupOp { set; get; }
        public List<SearchGroup> groups { set; get; }
        public List<SearchRule> rules { set; get; }
    }

    public class SearchRule
    {
        public string field { set; get; }
        public string op { set; get; }
        public string data { set; get; }

        public override string ToString()
        {
            return string.Format("'{0}' {1} '{2}'", field, op, data);
        }
    }

    public class SearchGroup
    {
        public string groupOp { set; get; }
        public List<SearchRule> rules { set; get; }
    }

   public IQueryable<T> ApplyFilter<T>(IQueryable<T> query, bool _search, string searchField, string searchString,
string searchOper, string filters, NameValueCollection form)

        [HttpPost]
        public ActionResult GetProducts(string sidx, string sord, int page, int rows,
                                        bool _search, string searchField, string searchString,
                                        string searchOper, string filters)
        {
            var list = ProductDataSource.LatestProducts;            

            var pageIndex = page - 1;
            var pageSize = rows;
            var totalRecords = list.Count;
            var totalPages = (int)Math.Ceiling(totalRecords / (float)pageSize);

            var productsQuery = list.AsQueryable();

            productsQuery = new JqGridSearch().ApplyFilter(productsQuery, _search, searchField, searchString,
                                                           searchOper, filters, this.Request.Form);
            var productsList = productsQuery.OrderBy(sidx + " " + sord)
                                            .Skip(pageIndex * pageSize)
                                            .Take(pageSize)
                                            .ToList();

            var productsData = new JqGridData
            {
                Total = totalPages,
                Page = page,
                Records = totalRecords,
                Rows = (productsList.Select(product => new JqGridRowData
                {
                    Id = product.Id,
                    RowCells = new List<string>
                               {
                                     product.Id.ToString(CultureInfo.InvariantCulture),
                                     product.Name,
                                     product.Supplier.CompanyName,
                                     product.Category.Name,
                                     product.Price.ToString(CultureInfo.InvariantCulture)
                                }
                })).ToArray()
            };
            return Json(productsData, JsonRequestBehavior.AllowGet);
        }

 $('#list').jqGrid({
//url access method type
mtype: 'POST',

 productsQuery = new JqGridSearch().ApplyFilter(productsQuery, _search, searchField, searchString,
  searchOper, filters, this.Request.Form);

context.Customers.Include(c => c.Orders).AsNoTracking()

public void SqlDataReader(string connectionString, string sql, params object[] parametersValues)

namespace ModelStateTest.Models
{
    public class User
    {
        public string Email { set; get; }
    }
}

using System.Web.Mvc;
using ModelStateTest.Models;

namespace ModelStateTest.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public ActionResult Index(User model)
        {           
            model.Email = "?";
            return View(model);
        }
    }
}

@model ModelStateTest.Models.User

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

@using (Html.BeginForm()) {
    @Html.ValidationSummary(true)

    <fieldset>
        <legend>User</legend>

        <div class="editor-label">
            @Html.LabelFor(model => model.Email)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Email)
            @Html.ValidationMessageFor(model => model.Email)
        </div>

        <p>
            <input type="submit" value="Create" />
        </p>
    </fieldset>
}

 model.Email = "?";

 this.ModelState.Remove("Email");

 <input type="text" name="Email" id="Email" value="@Model.Email" />

/// <summary>
    /// 
    /// </summary>
    public static class FullTextPrefixes
    {
        /// <summary>
        /// 
        /// </summary>
        public const string ContainsPrefix = "-CONTAINS-";

        /// <summary>
        /// 
        /// </summary>
        public const string FreetextPrefix = "-FREETEXT-";

        /// <summary>
        /// 
        /// </summary>
        /// <param name="searchTerm"></param>
        /// <returns></returns>
        public static string Contains(string searchTerm)
        {
            return string.Format("({0}{1})", ContainsPrefix, searchTerm);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="searchTerm"></param>
        /// <returns></returns>
        public static string Freetext(string searchTerm)
        {
            return string.Format("({0}{1})", FreetextPrefix, searchTerm);
        }

    }

public static class FullTextSearchExtensions
    {

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="TEntity"></typeparam>
        /// <param name="source"></param>
        /// <param name="expression"></param>
        /// <param name="searchTerm"></param>
        /// <returns></returns>
        public static IQueryable<TEntity> FreeTextSearch<TEntity>(this IQueryable<TEntity> source, Expression<Func<TEntity, object>> expression, string searchTerm) where TEntity : class
        {
            return FreeTextSearchImp(source, expression, FullTextPrefixes.Freetext(searchTerm));
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="TEntity"></typeparam>
        /// <param name="source"></param>
        /// <param name="expression"></param>
        /// <param name="searchTerm"></param>
        /// <returns></returns>
        public static IQueryable<TEntity> ContainsSearch<TEntity>(this IQueryable<TEntity> source, Expression<Func<TEntity, object>> expression, string searchTerm) where TEntity : class
        {
            return FreeTextSearchImp(source, expression, FullTextPrefixes.Contains(searchTerm));
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="TEntity"></typeparam>
        /// <param name="source"></param>
        /// <param name="expression"></param>
        /// <param name="searchTerm"></param>
        /// <returns></returns>
        private static IQueryable<TEntity> FreeTextSearchImp<TEntity>(this IQueryable<TEntity> source, Expression<Func<TEntity, object>> expression, string searchTerm)
        {
            if (String.IsNullOrEmpty(searchTerm))
            {
                return source;
            }

            // The below represents the following lamda:
            // source.Where(x => x.[property].Contains(searchTerm))

            //Create expression to represent x.[property].Contains(searchTerm)
            //var searchTermExpression = Expression.Constant(searchTerm);
            var searchTermExpression = Expression.Property(Expression.Constant(new { Value = searchTerm }), "Value");
            var checkContainsExpression = Expression.Call(expression.Body, typeof(string).GetMethod("Contains"), searchTermExpression);

            //Join not null and contains expressions

            var methodCallExpression = Expression.Call(typeof(Queryable),
                                                       "Where",
                                                       new[] { source.ElementType },
                                                       source.Expression,
                                                       Expression.Lambda<Func<TEntity, bool>>(checkContainsExpression, expression.Parameters));

            return source.Provider.CreateQuery<TEntity>(methodCallExpression);
        }

 public class FtsInterceptor : IDbCommandInterceptor
    {

        /// <summary>
        /// 
        /// </summary>
        /// <param name="command"></param>
        /// <param name="interceptionContext"></param>
        public void NonQueryExecuting(DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
        {
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="command"></param>
        /// <param name="interceptionContext"></param>
        public void NonQueryExecuted(DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
        {
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="command"></param>
        /// <param name="interceptionContext"></param>
        public void ReaderExecuting(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext)
        {
            RewriteFullTextQuery(command);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="command"></param>
        /// <param name="interceptionContext"></param>
        public void ReaderExecuted(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext)
        {
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="command"></param>
        /// <param name="interceptionContext"></param>
        public void ScalarExecuting(DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
        {
            RewriteFullTextQuery(command);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="command"></param>
        /// <param name="interceptionContext"></param>
        public void ScalarExecuted(DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
        {
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="cmd"></param>
        public static void RewriteFullTextQuery(DbCommand cmd)
        {
            var text = cmd.CommandText;
            for (var i = 0; i < cmd.Parameters.Count; i++)
            {
                var parameter = cmd.Parameters[i];
                if (
                    !parameter.DbType.In(DbType.String, DbType.AnsiString, DbType.StringFixedLength,
                        DbType.AnsiStringFixedLength)) continue;
                if (parameter.Value == DBNull.Value)
                    continue;
                var value = (string)parameter.Value;
                if (value.IndexOf(FullTextPrefixes.ContainsPrefix, StringComparison.Ordinal) >= 0)
                {
                    parameter.Size = 4096;
                    parameter.DbType = DbType.AnsiStringFixedLength;
                    value = value.Replace(FullTextPrefixes.ContainsPrefix, ""); // remove prefix we added n linq query
                    value = value.Substring(1, value.Length - 2); // remove %% escaping by linq translator from string.Contains to sql LIKE
                    parameter.Value = value;
                    cmd.CommandText = Regex.Replace(text,
                        string.Format(
                            @"\[(\w*)\].\[(\w*)\]\s*LIKE\s*@{0}\s?(?:ESCAPE N?'~')", parameter.ParameterName),
                        string.Format(@"CONTAINS([$1].[$2], @{0})", parameter.ParameterName));
                    if (text == cmd.CommandText)
                        throw new Exception("FTS was not replaced on: " + text);
                    text = cmd.CommandText;
                }
                else if (value.IndexOf(FullTextPrefixes.FreetextPrefix, StringComparison.Ordinal) >= 0)
                {
                    parameter.Size = 4096;
                    parameter.DbType = DbType.AnsiStringFixedLength;
                    value = value.Replace(FullTextPrefixes.FreetextPrefix, ""); // remove prefix we added n linq query
                    value = value.Substring(1, value.Length - 2); // remove %% escaping by linq translator from string.Contains to sql LIKE
                    parameter.Value = value;
                    cmd.CommandText = Regex.Replace(text,
                        string.Format(
                            @"\[(\w*)\].\[(\w*)\]\s*LIKE\s*@{0}\s?(?:ESCAPE N?'~')", parameter.ParameterName),
                        string.Format(@"FREETEXT([$1].[$2], @{0})", parameter.ParameterName));
                    if (text == cmd.CommandText)
                        throw new Exception("FTS was not replaced on: " + text);
                    text = cmd.CommandText;
                }
            }
        }

    }

public class Note
    {
        /// <summary>
        /// 
        /// </summary>
        public int Id { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string NoteText { get; set; }
    }

  public class FtsSampleContext : DbContext
    {
        /// <summary>
        /// 
        /// </summary>
        public DbSet<Note> Notes { get; set; }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="modelBuilder"></param>
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Configurations.Add(new NoteMap());
        }
    }

/// <summary>
    /// 
    /// </summary>
    class Program
    {
        /// <summary>
        /// 
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            DbInterception.Add(new FtsInterceptor());
            const string searchTerm = "john";
            using (var db = new FtsSampleContext())
            {
                var result1 = db.Notes.FreeTextSearch(a => a.NoteText, searchTerm).ToList();
                //SQL Server Profiler result ===>>>
                //exec sp_executesql N'SELECT 
                //    [Extent1].[Id] AS [Id], 
                //    [Extent1].[NoteText] AS [NoteText]
                //    FROM [dbo].[Notes] AS [Extent1]
                //    WHERE FREETEXT([Extent1].[NoteText], @p__linq__0)',N'@p__linq__0 
                //char(4096)',@p__linq__0='(john)'
                var result2 = db.Notes.ContainsSearch(a => a.NoteText, searchTerm).ToList();
                //SQL Server Profiler result ===>>>
                //exec sp_executesql N'SELECT 
                //    [Extent1].[Id] AS [Id], 
                //    [Extent1].[NoteText] AS [NoteText]
                //    FROM [dbo].[Notes] AS [Extent1]
                //    WHERE CONTAINS([Extent1].[NoteText], @p__linq__0)',N'@p__linq__0 
                //char(4096)',@p__linq__0='(john)'
            }
            Console.ReadKey();
        }
    }