Get values entered from view in controller - not a part of a model

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MVC

C#6.0

I am trying to get some user entered values from a view to the controller to filter the data that will be displayed. I have managed to get the view working as far as accepting the entries and then going back to the controller when the submit button is pressed but I can't seem to figure out a way to get the values from the textboxes of the view. I totally admit, I'm a complete noob when it comes to MVC outside the standard. Code posted as well. What can I do to get at the values in the textboxes to the controller on post?

Thanks

What I have tried:

UserSelection View:

@using (Html.BeginForm())
{
<div class="input-group date" data-provide="datepicker" id="txtbxStart">
    <input type="text" class="form-control">
    <div class="input-group-addon">
        <span class="glyphicon glyphicon-th"></span>
    </div>
</div>

<div class="input-group date" data-provide="datepicker" id="txtbxEnd">
    <input type="text" class="form-control">
    <div class="input-group-addon">
        <span class="glyphicon glyphicon-th"></span>
    </div>
</div>

<div class="form-group">
    <div class="col-md-offset-2 col-md-10">
        <input type="submit" value="Submit" class="btn btn-default" />
    </div>
</div>
}

Controller:

public ActionResult UserSelection()
{
    return View();
}
[HttpPost]
public ActionResult UserSelection(FormCollection form)
{
    TempData["dtStart"] = form["txtbxStart"].ToString();
    TempData["dtEnd"] = form["txtbxEnd"].ToString();

    return Redirect("Index");
}