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 formstring[] 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...