this is my controller method to pass ViewModel

What do you mean? Just

@model ModelsVM

<h1>@Model.Question.Whatever</h1>

<ul>
  @foreach (var thing in Model.OptionsList)
  {
    <li>@thing.Whatever</li>
  }
</ul>

@model OnlineExam.Models.ViewModels.OptionsVM
@{
ViewData["Title"] = "Edit";
}

<h1>Question Edit</h1>
<form method="post">
<div class="container">
<div class="row">
<h4>Edit Question or Add Options</h4>
</div>
</div>
<div>
<label asp-for="question.question">Question</label>
<input asp-for="question.question" />
<span asp-validation-for="question.question"></span>
</div>
@foreach(var obj in Model.OptionsList)
{
<div>
<label asp-for="@obj.option"></label>
<input asp-for="@obj.option" disabled/>
</div>
}
@<div>
<label asp-for="OptionsList"></label>
<input asp-for="@obj.option" />
</div>
<div>
<label asp-for="@obj.option"></label>
<input asp-for="@obj.option" disabled />
</div>@
<button type="submit" class="btn btn-primary">Update</button>
<a asp-controller="Question" asp-action="Index">Go Back</a>

</form>

this my view

Yeah

And what doesn't work about it?

Ah, wait, the issue is with how to create the form?

So that it sends multiple fields to the controller?

yes

Might need to name those fields manually

That is,

@for(var i = 0; i < @Model.Questions.Length; i++)
{
    <input type="text" name="Questions[@i]" id="Questions[@i]">
}

and you should be able to get it with

public async Task OnGet(List<string> Questions)
{

}

no no please come to coice chat

*voice

i will share my screen

I can't right now, sorry

ok wait

this my project repo

what i am trying to do is adding 4 input fields in view

Then add those 4 input fields

to take Input for Model Option's option(which Is a property)

Well, did you try the way I posted?

With naming them manually?

Ah, wait, I think I can see the issue...

Each answer has its own ID and stuff, so just sending a list of strings won't do

yes

thats why i added Option as Ienumarable<Option> in ViewModel

that option is connected to Question Model vie FK

Unless, perhaps,

@foreach(var q in Model.Questions)
{
    <input
        type="text"
        name="Questions[@q.Id]"
        id="Questions[@q.Id]"
        value="@q.Body">
}

public async Task OnPost(Dictionary<int, string> Questions)
{

}

Also, as a side note, line 59 of QuestionsController

  if(id == null&&id==0)

id cannot be both null and 0 at the same time

In any case, try the dictionary

If that fails, I'm out of ideas, sorry

sorry i shuld have put ||