System.ArgumentNullException:Object reference not set?

Question

Hi Team I am getting this exception "Object reference not set to an instance of an object". I am trying to create a checkbox within a form using asp.net mvc. Below is my logic and need some help around this issue to fix it, please mates. public class EditTrainingRegFormViewModel { public string Title { get ; set ; } public string FirstName { get ; set ; } public string LastName { get ; set ; } public string Position { get ; set ; } public string Company { get ; set ; } public string Address { get ; set ; } [Display(Name = "Choose country" )] public int ? SelectedCountryId { get ; set ; } public string Code { get ; set ; } public string City { get ; set ; } public string State { get ; set ; } public string Cell_Number { get ; set ; } public List Dietary_requirement { get ; set ; } public string Email { get ; set ; } public int Country_Id { get ; set ; } public string Country_Name { get ; set ; } } public class CheckBoxes { public string Text { get ; set ; } public bool Checked { get ; set ; } } // GET://Manage/Check box for Dietary-Req public ActionResult DietReq() { EditTrainingRegFormViewModel model = new EditTrainingRegFormViewModel(); model.Dietary_requirement = new List { new CheckBoxes {Text = "None" }, new CheckBoxes {Text = "Vegetarian" }, new CheckBoxes {Text = "Vegan" }, new CheckBoxes {Text = "Halaal" } }; return View(model); } class = "row" > for = "Dietary Requirements" >Dietary Requirements class = "input-group col-md-6 col-md-offset-3 col-sm-6 col-xs-6" > class = "input-group pull-left" > for checking each name from the list of available diets--> @ for ( int i = 0; i // Error is thrown here as not set to an instance. { @Html.HiddenFor(m=>m.Dietary_requirement[i].Text) @Html.CheckBoxFor(m=>m.Dietary_requirement[i].Checked, new {id = string .Format( "dietary_requirement_{0}" , i) }) }

Guest User · Answer

Nagaraju Its complaining about the object is not with the current context, esp when i declare it as same what you shown here. public class CheckBoxes { Dietary_requirement = new List (); } Its coming from the view Reddy inside the for loop statement, why im suprised as to why.

Sreekanth Reddy · Answer

Can you please trace the exact line, where you are getting the exception ?

Guest User · Answer

Im still not getting progressing, still doing the same thing over and again. See the new changes below if (Model.Dietary_requirement.Count>0) { @ for ( int i = 0; i { @Html.HiddenFor(m=>m.Dietary_requirement[i].Text) @Html.CheckBoxFor(m=>m.Dietary_requirement[i].Checked, new {id = string .Format( "dietary_requirement_{0}" , i) }) } }

Sreekanth Reddy · Answer

Write your for loop within the if condition. @if(Model.Dietary_requirement.Count>0) { // Go with your for loop here. } Thank you.

Vishvjit Shinde · Answer

Hi, the main reason above error is because of null or empty value we have to check the condition like this: if (Model.Dietary_requirement.Count>0) { @ for ( int i = 0; i { @Html.HiddenFor(m=>m.Dietary_requirement[i].Text) @Html.CheckBoxFor(m=>m.Dietary_requirement[i].Checked, new {id = string .Format( "dietary_requirement_{0}" , i) }) } }

Guest User · Answer

Do i remove the for loop and replace it with if statement to allow for empty object?

Rajanikant Hawaldar · Answer

@if(Model == null || Model.Dietary_requirement == null){ no items found } else{ @for(int i = 0; i m.Dietary_requirement[i].Text) @Html.CheckBoxFor(m=>m.Dietary_requirement[i].Checked, new {id = string.Format("dietary_requirement_{0}", i) }) } }