The first thing to do is to don't use the Bootstrap 3
class...
Try Bootstrap 2
instead... Replace col-xx-[1-12]
by span[1-12]
Your code with input in span11 :
<div id="content" class="row-fluid">
<div class="span12 main">
<h2>Product Data</h2>
<form class="form-horizontal">
<fieldset>
<div class="form-group row-fluid">
<label for="inputAppName" class="control-label span2">Application Name </label>
<div class="span10">
<input type="text" class="form-control span11" id="app_name" name="app_name" placeholder="Application Name">
</div>
</div>
<div style="height:10px;">
</div>
<div class="form-group row-fluid">
<label for="inputAppDesc" class="control-label span2">Description </label>
<div class="span10">
<textarea class="form-control span11" id="app_desc" name="app_desc" rows="4" placeholder="Application Description"></textarea>
</div>
</div>
</fieldset>
</form>
</div>
</div>