Kendo Mvc GridHelper

@(Html.CustomKendoGrid<ViewModels.UserViewModel>("grid"))

namespace Kendo.Mvc.UI
{
    //read here about Func vs Action https://stackoverflow.com/a/12687775/249895
    public static class KendoMvcGridHelper
    {

        public static readonly int AxajPageSize = 20;
        public static readonly int AxajPageSizeSmall = 10;

        public static Kendo.Mvc.UI.Fluent.GridBuilder CustomKendoGrid(this HtmlHelper helper, string name) where T : class
        {
            var returnGridBuilder = helper.Kendo().Grid();
            returnGridBuilder = returnGridBuilder.Name(name);
            returnGridBuilder = ConfigureGridBuilder(returnGridBuilder);

            return returnGridBuilder;
        }

        private static GridBuilder ConfigureGridBuilder(GridBuilder gridBuilder) where T : class
        {
            gridBuilder = gridBuilder.Pageable(p => p.PageSizes(new List<int>() { 10, 20 }));
            gridBuilder = gridBuilder.Sortable();
            gridBuilder = gridBuilder.Resizable(r => r.Columns(true));
            gridBuilder = gridBuilder.Filterable(ConfigureGridFilterableSettingsBuilder);
            gridBuilder = gridBuilder.Pageable();
            return gridBuilder;
        }


        public static void ConfigureGridFilterableSettingsBuilder(GridFilterableSettingsBuilder config)        
        {
            config = config.Mode(GridFilterMode.Row).Extra(false);
            config = config.Operators(ConfigureFilterableOperators);
        }

        public static void ConfigureFilterableOperators(FilterableOperatorsBuilder operators)
        {
            operators = operators.ForString(str => str.Clear()
                        .IsEqualTo("Is equal to")
                        .IsNotEqualTo("Is not equal to")
                        .StartsWith("Starts with")
                        .EndsWith("Ends with")                        
                        .Contains("Contains")
                        .DoesNotContain("Does not contain")
                    )
                    .ForDate(str => str.Clear()
                        .IsEqualTo("Is Equal To")
                        .IsGreaterThan("Is Greater Than")
                        .IsGreaterThanOrEqualTo("Is Greater Than Or Equal To")
                        .IsLessThan("Is Less Than")
                        .IsLessThanOrEqualTo("Is Less Than Or Equal To")
                        .IsNotEqualTo("Is Not Equal To")
                    )
                    .ForEnums(str => str.Clear()
                        .IsEqualTo("Is Equal To")
                        .IsNotEqualTo("Is Not Equal To")
                    )
                    .ForNumber(str => str.Clear()
                        .IsEqualTo("Is Equal To")
                        .IsGreaterThan("Is Greater Than")
                        .IsGreaterThanOrEqualTo("Is Greater Than Or Equal To")
                        .IsLessThan("Is Less Than")
                        .IsLessThanOrEqualTo("Is Less Than Or Equal To")
                        .IsNotEqualTo("Is Not Equal To")
                    );
        }
    }
}