[font color=#FF0000]//我创建了一个类，里面创建了一个方法，达到调用方法时传入一串字符，能返回一个一串加密后的字符，但怎么试都有错，请帮我看下是哪里的问题呀，谢谢。[/font]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.Security.Cryptography;   //加密解密用
using System.IO;                      //MemoryStream文件流用


namespace 从ini文件中读取数据库连接
{
    class DBConfig
    {
        public string Encryp (string what)
    {

             string encryptKey = "secr";//加密key
                         


            try
            {

                DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();
                byte[] key = Encoding.Unicode.GetBytes(encryptKey);
                byte[] data = Encoding.Unicode.GetBytes(what.Trim());
                MemoryStream MStream = new MemoryStream();
                CryptoStream CStream = new CryptoStream(MStream, descsp.CreateEncryptor(key, key), CryptoStreamMode.Write);
                CStream.Write(data, 0, data.Length);
                CStream.FlushFinalBlock();
                return Convert.ToBase64String(MStream.ToArray());
               
                
            }
            catch
            {
                MessageBox.Show("加密失败！");
            }
        }
        public string test()            //有返回值的方法
        {
            string t = "您好！";          //设定变量
            return t;                     //返回t变量
        }

    }
}