Create cross(X) sign that is use for cancle writeted text in textbox_

Question

I have used the below code is working fine but instead of an HTML controller, I have to use the asp.net text box controller. 

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<style>
  input[type="search"]::-webkit-search-cancel-button {
    -webkit-appearance: searchfield-cancel-button;
  }
</style>
<div class="form-inline">
  <input type="search" placeholder="Search..." class="form-control" />
</div>