update operation for dynamic textbox in mvc

Question

i am updating some values of dynamic textboxes but these causes an error ....... sometmes values updating sometimes these values going null in mvc ................why it happens suggest me

Indu Yadav · Answer

[HttpPost] [ValidateInput(false)] public ActionResult Editproduct(string[] TestBoxStringList, FormCollection form,string[] stringList1, string[] textboxlist1, string[] textboxlist2, Product model, int id, HttpPostedFileBase image1, HttpPostedFileBase image2, HttpPostedFileBase image3, HttpPostedFileBase image4) { if (ModelState.IsValid) { string ImgPath1 = null; if (image1 != null) { var x = (from c in context.productdetail where c.Id ==id select c).FirstOrDefault(); //x.TextBox1 = null; //x.TextBox2 = null; string path1 = Server.MapPath("~/ProductImage/" + x.Photo1); FileInfo fi = new FileInfo(path1); if (fi.Exists) fi.Delete(); var Filename = Path.GetFileName(image1.FileName); Random RandomClass = new Random(); int randmno = RandomClass.Next(345678); string trfile1 = randmno.ToString() + Filename.ToString(); var path2 = "~/ProductImage/" + trfile1; image1.SaveAs(Server.MapPath(path2)); ImgPath1 = trfile1; model.Photo1 = trfile1; } if (model.Photo1 == null) { model.Photo1 = form["photo1"].ToString(); } string ImgPath2 = null; if (image2 != null) { var x2 = (from c in context.productdetail where c.Id == id select c).FirstOrDefault(); string path3 = Server.MapPath("~/ProductImage/" + x2.Photo1); FileInfo fi = new FileInfo(path3); if (fi.Exists) fi.Delete(); var Filename = Path.GetFileName(image2.FileName); Random RandomClass = new Random(); int randmno = RandomClass.Next(345678); string trfile2 = randmno.ToString() + Filename.ToString(); var path4 = "~/ProductImage/" + trfile2; image2.SaveAs(Server.MapPath(path4)); ImgPath2 = trfile2; model.Photo2 = trfile2; } if (model.Photo2 == null) { model.Photo2 = form["photo2"].ToString(); } string ImgPath3 = null; if (image3 != null) { var x3 = (from c in context.productdetail where c.Id == id select c).FirstOrDefault(); string path5 = Server.MapPath("~/ProductImage/" + x3.Photo3); FileInfo fi = new FileInfo(path5); if (fi.Exists) fi.Delete(); var Filename = Path.GetFileName(image3.FileName); Random RandomClass = new Random(); int randmno = RandomClass.Next(345678); string trfile3 = randmno.ToString() + Filename.ToString(); var path6 = "~/ProductImage/" + trfile3; image3.SaveAs(Server.MapPath(path6)); ImgPath3 = trfile3; model.Photo3 = trfile3; } if (model.Photo3 == null) { model.Photo3 = form["photo3"].ToString(); } string ImgPath4 = null; if (image4 != null) { var x4 = (from c in context.productdetail where c.Id == id select c).FirstOrDefault(); string path7 = Server.MapPath("~/ProductImage/" + x4.Photo4); FileInfo fi = new FileInfo(path7); if (fi.Exists) fi.Delete(); var Filename = Path.GetFileName(image4.FileName); Random RandomClass = new Random(); int randmno = RandomClass.Next(345678); string trfile4 = randmno.ToString() + Filename.ToString(); var path8 = "~/ProductImage/" + trfile4; image4.SaveAs(Server.MapPath(path8)); ImgPath4 = trfile4; model.Photo4 = trfile4; } if (model.Photo4 == null) { model.Photo4 = form["photo4"].ToString(); //obj.Photo4 = model.Photo4; } var textboxid1 = ""; var Newtextboxid1 = ""; if (TestBoxStringList != null) { } if (textboxlist1 != null) { List Newlist = new List (textboxlist1); foreach (var item in Newlist) { if (item != "") { Newtextboxid1 += item.ToString() + ","; } } Newtextboxid1 = Newtextboxid1.Remove(Newtextboxid1.Length - 1, 1); } if ( TestBoxStringList != null) { List list1 = new List (TestBoxStringList); foreach (var item in list1) { if (item != "") { textboxid1 += item.ToString() + ","; } } textboxid1 = textboxid1.Remove(textboxid1.Length - 1, 1); } var textboxid2 = ""; var Newtextboxid2 = ""; if (textboxlist2 != null) { List Newlist2 = new List (textboxlist2); foreach (var Newitem in Newlist2) { if (Newitem != "") { Newtextboxid2 += Newitem.ToString() + ","; } } Newtextboxid2 = Newtextboxid2.Remove(Newtextboxid2.Length - 1, 1); } if (stringList1 != null) { List list2 = new List (stringList1); foreach (var item in list2) { if (item != "") { textboxid2 += item.ToString() + ","; } } textboxid2 = textboxid2.Remove(textboxid2.Length - 1, 1); } //model.TextBox1 = null; //model.TextBox2 = null; if (Newtextboxid1!=null && Newtextboxid1!="") { textboxid1 = textboxid1 + "," + Newtextboxid1; textboxid1 = textboxid1.TrimStart(','); } if (Newtextboxid2 != null && Newtextboxid2 !="") { textboxid2 = textboxid2 +"," + Newtextboxid2; textboxid2 = textboxid2.TrimStart(','); } else { } model.TextBox1 = textboxid1; model.TextBox2 = textboxid2; //text = text.TrimStart(arr); var currentProduct = context.productdetail.Find(model.Id); context.Entry(currentProduct).CurrentValues.SetValues(model); context.SaveChanges(); return RedirectToAction("AddProducts", "Decorika"); } return RedirectToAction("Editproduct", "Decorika"); } add @for (int i = 0; i { var m = 0; @Html.TextBoxFor(x => x.TestBoxStringList[i], new { @name = "textboxlist1", @id =m, }) @Html.TextBoxFor(x => x.stringList1[i], new { @name = "textboxlist2", @id = m, }) X jQuery(document).ready(function () { debugger $("#append").click(function (e) { debugger e.preventDefault(); $(".inc").append(' \ \ \ X \ \ \ '); return false; }); jQuery(document).on('click', '.remove_this', function () { jQuery(this).parent().remove(); return false; }); $(document).on('click', 'button.removebutton', function () { debugger ///alert("aa"); $(this).closest('div').remove(); return false; }); $("input[type=submit]").click(function (e) { e.preventDefault(); $(this).next("[name=textbox3]") .val( $.map($(".inc :text"), function (el) { return el.value }).join(",
") ) }) }); }

Manas Mohapatra · Answer

Please share relevant code how you are updating values to textboxes. You are getting null values, it might your model/object is null...