ASP.NET Core 2 MVC CheckBoxFor always returning false in model

I know there were a number of people that faced this issue but I don't feel like they ever resolved it.

I have a razor page like this:

@model MyModel
<div>
    @using (Html.BeginForm("MyMethod", "Home", FormMethod.Get))
    {
        @Html.CheckBoxFor(model => model.MyBool)
        @Html.LabelFor(model => model.MyBool)
        <input type="submit" class="btn" value="Fire it up" />
    }
</div>

My model looks like this:

public class MyModel
{
    [DisplayName("My checkbox")]
    public bool MyBool {get; set;}
}

And my method in the home controller looks like this:

public IActionResult MyMethod(MyModel model)
{
    return View();
}

Everything looks good to me, but then, no matter if I check the checkbox or not, the model parameter in the MyMethod method is always false after I submit the form.

What am I doing wrong?

EDIT:

When I check the checkbox the GET request contains both values - true and false. I saw some people say that MVC should handle it but it apparently doesn't.

So, what happens is that when you don't check an HTML checkbox, the value sent by default is null. But when you are using the HTML helper @Html.CheckBoxFor(model => model.MyBool), it is automatically creating a Checkbox for the MyBool value as you asked, and additionally a @Html.Hidden("MyBool",false). What this will do is, if MyBool doesn't have any value (if checkbox isn't checked), it will pass False, instead of null.

HTML created:

  <input id="MyBool" name="MyBool" type="checkbox" value="true">
  <input name="MyBool" type="hidden" value="false">