ASP.NETでWeb.configからログインする際の正しいアカウントパスワードを確認する

<configuration>
    <system.web>
      <compilation debug="true" targetFramework="4.5.2" />
      <httpRuntime targetFramework="4.5.2" />

      <authentication mode="Forms">
        <! --loginUrl is the page where authentication fails to go defaultUrl is the page where authentication succeeds to access -->
        <forms loginUrl="Login.aspx" defaultUrl="/Admin/Admin.aspx" path="/" name=".ASPXAUTH">

          <credentials passwordFormat="Clear">
            <! --account password can be seen -->
            <user name="admin" password="123"/>
            <user name="guest" password="1234"/>
            <! --authenticated user account password -->
          </credentials>
        </forms>
      </authentication>
    
      
      <! -- Disable access for unauthenticated users -- >
      <authorization>
        <deny users="? "/> <! -- Deny anonymous users who are not logged in -- >
        <deny users="guest"/> <! -- Deny users with the account guest -- >    
        <allow users="admin"/> <! --allow users with account admin-->
      </authorization>

    </system.web>

</configuration>

            If (FormsAuthentication.Authenticate(this.TextBox1.Text, this.TextBox2.Text)) //see if there is an authenticated user inside the configuration file
            Text
                FormsAuthentication.RedirectFromLoginPage(this.TextBox1.Text, true); //Save the cookie and open the address to go to
            }