where is bootstrap link in asp.net template pages - asp.net

Question

(in vs 2015/asp.net/web forms template)there is several web pages like Register page and login page.all the elements on this pages is created with bootstrap , but I wondered there isn't any bootstrap link command in html source of this pages :
<%# Page Title="Log in" Language="VB" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeFile="Login.aspx.vb" Inherits="Account_Login" Async="true" %>
<%: Title %>.
<div class="row">
<div class="col-md-8">
<section id="loginForm">
<div class="form-horizontal">
<h4>Use a local account to log in.</h4>
<hr />
<asp:PlaceHolder runat="server" ID="ErrorMessage" Visible="false">
<p class="text-danger">
<asp:Literal runat="server" ID="FailureText" />
</p>
</asp:PlaceHolder>
<div class="form-group">
<asp:Label runat="server" AssociatedControlID="UserName" CssClass="col-md-2 control-label">User name</asp:Label>
<div class="col-md-10">
<asp:TextBox runat="server" ID="UserName" CssClass="form-control" />
<asp:RequiredFieldValidator runat="server" ControlToValidate="UserName"
CssClass="text-danger" ErrorMessage="The user name field is required." />
</div>
</div>
<div class="form-group">
<asp:Label runat="server" AssociatedControlID="Password" CssClass="col-md-2 control-label">Password</asp:Label>
<div class="col-md-10">
<asp:TextBox runat="server" ID="Password" TextMode="Password" CssClass="form-control" />
<asp:RequiredFieldValidator runat="server" ControlToValidate="Password" CssClass="text-danger" ErrorMessage="The password field is required." />
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<div class="checkbox">
<asp:CheckBox runat="server" ID="RememberMe" />
<asp:Label runat="server" AssociatedControlID="RememberMe">Remember me?</asp:Label>
</div>
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<asp:Button runat="server" OnClick="LogIn" Text="Log in" CssClass="btn btn-default" />
</div>
</div>
</div>
<p>
<asp:HyperLink runat="server" ID="RegisterHyperLink" ViewStateMode="Disabled">Register</asp:HyperLink>
if you don't have a local account.
</p>
</section>
</div>
<div class="col-md-4">
<section id="socialLoginForm">
<uc:openauthproviders runat="server" id="OpenAuthLogin" />
</section>
</div>
</div>
where can I find the bootstrap link command?

Answer 1

HI Pooya as you can see this page is child page and all the links are define in master like bootstrap and js file
Child page - login.aspx
Master Page - site.master
so you can find all the link in site.master page