Encrypt and Decrypt Files using AES Encryption in ASP.Net using C#

This way

    protected void Page_Load(object sender, EventArgs e)
    {
        Encrypt(Server.MapPath("~/Files/Test.PDF"), Server.MapPath("~/Files/Test2.PDF"));
        Decrypt(Server.MapPath("~/Files/Test2.PDF"), Server.MapPath("~/Files/Test3.PDF"));
    }
    private void Encrypt(string inputFilePath, string outputfilePath)
    {
        string EncryptionKey = "MAKV2SPBNI99212";
        using (Aes encryptor = Aes.Create())
        {
            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
            encryptor.Key = pdb.GetBytes(32);
            encryptor.IV = pdb.GetBytes(16);
            using (FileStream fs = new FileStream(outputfilePath, FileMode.Create))
            {
                using (CryptoStream cs = new CryptoStream(fs, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    FileStream fsIn = new FileStream(inputFilePath, FileMode.Open);
                    int data;
                    while ((data = fsIn.ReadByte()) != -1)
                    {
                        cs.WriteByte((byte)data);
                    }
                }

            }
        }

    }

    private void Decrypt(string inputFilePath, string outputfilePath)
    {
        string EncryptionKey = "MAKV2SPBNI99212";
        using (Aes encryptor = Aes.Create())
        {
            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
            encryptor.Key = pdb.GetBytes(32);
            encryptor.IV = pdb.GetBytes(16);
            using (FileStream fs = new FileStream(inputFilePath, FileMode.Open))
            {
                using (CryptoStream cs = new CryptoStream(fs, encryptor.CreateDecryptor(), CryptoStreamMode.Read))
                {
                    using (FileStream fsOut = new FileStream(outputfilePath, FileMode.Create))
                    {
                        int data;
                        while ((data = cs.ReadByte()) != -1)
                        {
                            fsOut.WriteByte((byte)data);
                        }
                    }
                }
            }
        }
    }

using System.IO;
using System.Security.Cryptography;