C#Rijndael加密不接受任何密钥；mykey123”；

我在http://www.codeproject.com/Articles/26085/File-Encryption-and-Decryption-in-C.当我使用静态键// string password = @"myKey1234"; // Your Key Here时，它工作得很好。当我传入不同的密钥时，它不起作用string password = @keyPwd;。您可以在我的代码中看到，我正在向函数传递密钥，但它不起作用。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CSVEncrypts
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        string inputFile = "";
        string outputFilePath = "";
        string oFilePathName = "";
// EncryptFile
        private void EncryptFile(string inputFile, string outputFile,string keyPwd )
        {
            try
            {
               // string password = @"myKey123"; // Your Key Here
                string password = @keyPwd; 
                UnicodeEncoding UE = new UnicodeEncoding();
                byte[] key = UE.GetBytes(password);
                string cryptFile = outputFile;
                FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);
                RijndaelManaged RMCrypto = new RijndaelManaged();
                CryptoStream cs = new CryptoStream(fsCrypt,RMCrypto.CreateEncryptor(key, key),CryptoStreamMode.Write);
                FileStream fsIn = new FileStream(inputFile, FileMode.Open);
                int data;
                while ((data = fsIn.ReadByte()) != -1)
                    cs.WriteByte((byte)data);
                fsIn.Close();
                cs.Close();
                fsCrypt.Close();
            }
            catch
            {
                MessageBox.Show("Encryption failed!", "Error");
            }
        }

// Decrypt
        private void DecryptFile(string inputFile, string outputFile, string keyPwd)
        {
            {
                //string password = @"myKey123"; // Your Key Here
                string password = @keyPwd; // Your Key Here
                UnicodeEncoding UE = new UnicodeEncoding();
                byte[] key = UE.GetBytes(password);
                FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);
                RijndaelManaged RMCrypto = new RijndaelManaged();
                CryptoStream cs = new CryptoStream(fsCrypt,
                RMCrypto.CreateDecryptor(key, key),CryptoStreamMode.Read);
                FileStream fsOut = new FileStream(outputFile, FileMode.Create);
                int data;
                while ((data = cs.ReadByte()) != -1)
                fsOut.WriteByte((byte)data);
                fsOut.Close();
                cs.Close();
                fsCrypt.Close();
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
           if (inputFile != "")
            {
                oFilePathName = outputFilePath + "''" + textBox1.Text;
                EncryptFile(inputFile, oFilePathName,keytextBox.Text);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (inputFile != "") ;
            {
                oFilePathName = outputFilePath + "''" + textBox1.Text;
              DecryptFile(inputFile, oFilePathName, keytextBox.Text);
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            OpenFileDialog InputOpenFileDialog1 = new OpenFileDialog();
            if (InputOpenFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                string strInfilename = InputOpenFileDialog1.FileName;
                button3.Text = strInfilename;
                inputFile = strInfilename;
                outputFilePath = Path.GetDirectoryName(inputFile);
            }
        }

    }
}