namespace 
{
    public class RazorPage.cs : InheritedFromClass
    {
        public class GenericClass
        {
            //[Key, Column(Order = 1)]
            //[Required]
            //[Display(Name = "ID")]
            //public int ID { get; set; }

            [MaxLength(30)]
            [StringLength(30)]
            [Required(AllowEmptyStrings = true)]
            [DisplayFormat(ConvertEmptyStringToNull = false)]
            [Display(Name = "Column1")]
            public string Column1 { get; set; }

            [MaxLength(75)]
            [StringLength(75)]
            [Display(Name = "Column2")]
            public string Column2 { get; set; }

            [MaxLength(15)]
            [StringLength(15)]
            [Display(Name = "Column3")]
            public string Column3 { get; set; }

            [Display(Name = "Column4")]
            public double? Column4 { get; set; }
        }
        [BindProperty]
        public IList<GenericClass> Class { get; set; }

        public async Task<JsonResult> OnGetData_Source_Products_Read([DataSourceRequest] DataSourceRequest request)
        {
            if (Class == null)
            {
                Class = Enumerable.Range(1, 1).Select(x => new GenericClass()
                {
                    Column1 = "",
                    Column2 = "",
                    Column3 = "",
                    Column4 = null,
                }).ToList();
            }

            return new JsonResult(await Class.ToDataSourceResultAsync(request));
        }
        public ActionResult OnPostData_Source_Products_Submit([DataSourceRequest] DataSourceRequest request, IList<GenericClass> Class)
        {
            if (ModelState.IsValid)
            {
                foreach (var created in Class)
                {
                    Class.Add(created);                    
                }

                db.GenericClass.AddRange(Class);

                return new JsonResult(200);
            }
            else
            {
                return StatusCode(400, "The models contain invalid property values.");
            }
        }
    }
}