how to implement grouping in DropDownList while bingding from database

Question

<select name="languages" id="lang"  class="form-control form-control-sm">
  <optgroup label="first-choice">
    <option value="select">Select a language</option>
    <option value="javascript">JavaScript</option>
    <option value="php">PHP</option>
    <option value="java">Java</option>
    <option value="golang">Golang</option>
  </optgroup>
  <optgroup label="second-choice">
    <option value="python">Python</option>
    <option value="c#">C#</option>
    <option value="C++">C++</option>
    <option value="erlang">Erlang</option>
  </optgroup>
</select>

the above code To implement this contol

<asp:DropDownList ID="ddlTicketType" runat="server" >
</asp:DropDownList>