NullableDataTablesModelBinder.cs

using System.Linq;
using System.Web.Mvc;

namespace RootHelpers.Datatables
{
    public class NullableDataTablesModelBinder : IModelBinder
    {
        private DataTablesModelBinder dataTablesModelBinder = null;

        public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            DataTablesParam obj = new DataTablesParam();
            var request = controllerContext.HttpContext.Request.Params;

            if (request.AllKeys.Contains("iDisplayStart")
                && request.AllKeys.Contains("iDisplayLength")
                && request.AllKeys.Contains("iColumns")
                && request.AllKeys.Contains("iSortingCols")
                && request.AllKeys.Contains("sEcho"))
            {
                if (dataTablesModelBinder == null)
                {
                    dataTablesModelBinder = new DataTablesModelBinder();
                }
                return dataTablesModelBinder.BindModel(controllerContext, bindingContext);
            }
            else
            {
                return null;
            }
        }
    }
}