How to disable validation on hidden controls

I'm using bootstrap in my application.

Default.aspx

<div class="form-horizontal">
  <div id="Control1">
    <div class="control-group">
      <label class="control-label">DropDown Control
      </label>
      <div class="controls">
        <select data-val="true" data-val-required="Field is required" name="">
        <option value="">--Select--</option> 
        <option value=1>Value1</option>
        <option value=2>Value2</option>
        </select>
      </div>
    </div>
  </div>
  <div id="Control2" style="display;none;">
    <div class="control-group">
        <label class="control-label">Textbox Control
        </label>
       <div class="controls">
        <input type="text" id="txtId" data-val="true" data-val-required="Field is required"/>
       </div>
    </div>
  </div>
</div>   
<button id="btnSubmit" class="btn btn-success" onclick="Submit();">
  Submit</button>

<script type="text/javascript">

  $.validator.setDefaults({
    ignore: "hidden"
  });

  function Submit() {
    if (!$('#Form1').valid()) {
      return false;
    }
  }
</script>

Here i need to validate only the Control1 div. I dont want to validate hidden div (Control2), but it is getting validated.

I'm using

js/jquery.validate.min.js
js/uncompressed/jquery.validate.js
js/uncompressed/jquery.validate.unobtrusive.js

Please help me.