MVC checkbox list bounding to model - asp.net-mvc-4

Question

I am trying to collect all the options that the user have selected for a checkbox list. The checkbox list is built using a foreach loop and I have a int[] that I am trying to put the id into. Any help would be great.
View
#{
int idxFormats = 0;
foreach (var item in Model.ListOfFormats)
{
<div class='col-md-6'>
<input type="checkbox" value=#item.Value name="chkFormat" />
<label asp-for=#item.Selected>#Html.Raw(#item.Name)</label>
#Html.HiddenFor(m => Model.selectedFormats[idxFormats]);
</div>
idxFormats++;
}
#Html.ValidationMessageFor(model => model.selectedFormats[idxFormats])
}
Model
public List<GenericValues> ListOfFormats { get; set; }
[Display(Name = "At least one 'Format' must be selected")]
public int[] selectedFormats { get; set; }

Answer 1

Change the Checkbox name to selectedFormats
<input type="checkbox" value=#item.Value name="selectedFormats" />
Test example:
Model:
public class Test
{
public List<GenericValues> ListOfFormats { get; set; }
public int[] selectedFormats { get; set; }
}
public class GenericValues
{
public int Value { get; set; }
public string Name { get; set; }
public bool Selected { get; set; }
}
View:
#model Test
#{
ViewData["Title"] = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h1>Index</h1>
<form method="post">
#{
foreach (var item in Model.ListOfFormats)
{
<div class='col-md-6'>
<input type="checkbox" value=#item.Value name="selectedFormats" />
<label asp-for=#item.Selected>#Html.Raw(#item.Name)</label>
</div>
}
}
<input type="submit" value="submit" />
</form>
Controller:
public IActionResult Index()
{
Test test = new Test
{
ListOfFormats = new List<GenericValues>
{
new GenericValues
{
Name = "A",
Value = 1,
},
new GenericValues
{
Name = "B",
Value = 2,
},
new GenericValues
{
Name = "C",
Value = 3,
}
}
};
return View(test);
}
[HttpPost]
public IActionResult Index(Test test)
{
return Ok();
}
Result:

Answer 2

if you are looking to put id as value of your idxFormats then use this code in your checkbox:
<input type="checkbox" value=#item.Value name="chkFormat" id="#idxFormats" />
Edit:
I am not so familiar with c#, I tested with minimum code :
// Replace the model correct path by yours
#model IEnumerable<WebApplication1.Models.MyModels.ListOfFormats>
#{
int idxFormats = 0;
foreach (var item in Model)
{
<div class='col-md-6'>
<input type="checkbox" value=#item.Value name="chkFormat" id="#idxFormats"/>
<label>#Html.Raw(#item.Name)</label>
</div>
idxFormats++;
}
}