when pass variable ids from view to controller give me null

Question

Problem in server side(controller)

pass value of ids from view to controller give me null value in controller when i check in break point although it have value in client side jquery

public ActionResult Edit(FormCollection form)
{
// check string ids give me null value although text box ids have value in view

string ids = form["ids"];
return View();
}

This variable ids represent as text box in view and i check it in view it have values. this text box have values after i remove courses from table it send removed courses ids to text box ids .

$("#tb").on("click", ".r", function () {
$(this).parent().parent().hide();
$(this).parent().prev().prev().find("input").addClass("remove");
var ids = [];
var i = 0;
$(".remove").each(function () {
ids[i] = $(this).val();
i++;
});
$("#ids").val(ids);
});
@using (Html.BeginForm())
{
<div>
<table id="tb"></table>
<input type="submit" value="save" />
<input type="text" name="ids" id="ids" />
</div>
<table id="tb">

</table>
}

see image to more clear understand enter image description here