密码加密大写字母c#的问题

using System;
using System.Security.Cryptography;
using System.Text;

public class Program
{
    public static void Main()
    {
        string password = "MyPassword123";
        string encryptedPassword = EncryptPassword(password);
        
        Console.WriteLine("Encrypted Password: " + encryptedPassword);
    }
    
    public static string EncryptPassword(string password)
    {
        byte[] encryptedBytes;
        
        using (Aes aes = Aes.Create())
        {
            // 设置加密密钥和初始化向量
            byte[] key = Encoding.UTF8.GetBytes("ThisIsMySecretKey123");
            byte[] iv = Encoding.UTF8.GetBytes("ThisIsMyIV456");
            
            // 创建加密器
            using (var encryptor = aes.CreateEncryptor(key, iv))
            {
                // 将密码转换为字节数组
                byte[] passwordBytes = Encoding.UTF8.GetBytes(password);
                
                // 加密密码
                encryptedBytes = encryptor.TransformFinalBlock(passwordBytes, 0, passwordBytes.Length);
            }
        }
        
        // 将加密后的字节数组转换为Base64字符串
        string encryptedPassword = Convert.ToBase64String(encryptedBytes);
        
        return encryptedPassword;
    }
}