Loop of checkboxes to add objects to model list - asp.net-mvc-5

Question

I have a model (called plan) which one of its properties is a list (ICollection) of Exercises (which is another model):
public int Id { get; set; }
public virtual ICollection<Exercise> Exercises { get; set; }
So i tried to create a view that creates a plan and another view to add Exercises to the plan from exercises in the database.
So i did a loop that ranges all the exercises from the DB and for each one i added a check box with and id same as the id of the exercise and i thought i could do something with it but i tried so many things and ways and i couldn't even sent the input of the check boxes to the controller.
I must say that i'm kinda new with programming with mvc and i tried to look all over the internet and i didn't really know people who knows to program so this is really my last chance to solve it. Sorry if it was a long post or too easy for you to even comment but i really need this.
This is very specific for my project and what i stacked on was to sent the input to the controller but i'm open to different solutions cause i'm desperate.
public async Task<ActionResult> AddExercises(string id,int[] selectedExercises)
{
List<Exercise> list = new List<Exercise>();
foreach (int i in selectedExercises)
{
list.Add(db.Exercises.Find(i));
}
db.Plans.Find(id).Exercises = list;
await db.SaveChangesAsync();
return RedirectToAction("index");
}
I am sure its wrong and the view i tried is:
#using (Html.BeginForm("index", "Plans"))
{
#Html.AntiForgeryToken()
foreach (var i in Model.Exercises)
{
<table class="table">
<tr>
<td>#Html.DisplayFor(modelItem => i.Level)</td>
<td>#Html.DisplayFor(modelItem => i.Description)</td>
<td>#Html.DisplayFor(modelItem => i.MoreDescription)</td>
<td>
#Html.ActionLink("Edit", "Edit", new { id = i.Id }) |
#Html.ActionLink("Details", "Details", new { id = i.Id }) |
<input type="checkbox" class="selectedObjects" id="i.id" /> |
</td>
</tr>
</table>
}
#Html.ActionLink("Finish", "AddExercises")
}
I use viewModel PlanExercise in this view

Answer 1

Your checkboxes do not have either a name attribute or a value attribute so there is nothing to submit. You html needs to be
<input type="checkbox" name="selectedExercises" value="#i.id" />
and then in order to submit the form, you need a submit button (remove #Html.ActionLink("Finish", "AddExercises"))
<input type="submit" value="Save" />
and the form needs to be (assuming the controller is FinishController)
#using (Html.BeginForm("AddExercises", "Finish"))
and the method needs to be marked with the [HttpPost] attribute.