jquery when checkbox is not checked hide a textbox

i have a text box and a checkbox, when the checkbox is unchecked , i need to disabled the text box and when the user selects the checkbox, i want to re enable the textbox

i tried this:

asp.net code:/h3>

<div class="checkConfiguration">
                                <asp:CheckBox runat="server" ID="stopGeneralNumber" Text="General Number"   CssClass="cbStopReason" Checked="false" />
                                <asp:TextBox runat="server" Enabled="false"></asp:TextBox>
                            </div>

Jquery code

 $('.cbStopReason').on('click', function () {
        if ($(this).attr('checked')) {
            alert("now checked");
            $(this).nextAll("input").removeAttr("disabled");
        } else {
            alert("now un checked");
            $(this).nextAll("input").attr("disabled", "disabled"); 
        }
    })

the jquery code is already in document ready function, but the problem is that my code works good to disable the textbox, but it doesn't work to re enable it , what wrong did i do please?