instantiation

Hello. can anyone help me on how to instantiate the class inside App_Code/BLL folder to my aspx.cs?

Under MyWebApplication Project is an App_Code folder. Inside App_Code folder is BLL folder where I put my class BLLEmployee.

Here's my aspx.cs code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace MyWebApplication.Employee
{
    public partial class Employee_New : System.Web.UI.Page
    {        
        
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnAdd_OnClick(object sender, EventArgs e)
        {
            
        }

        protected void btnClear_OnClick(object sender, EventArgs e)
        {

        }

    }
}

And here's my BLLEmployee.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MyWebApplication.App_Code.BLL
{
    public class BLLEmployee
    {
        public string firstName { get; set; }
        public string middleName { get; set; }
        public string lastName { get; set; }
    }
}

Thank you in advance :-)