控件滚动方法：

复制代码 代码如下:
//具体方法
//Movegroup(string u, Panel p1, Panel p2)
//Movegroup(方向<或>,被移走的控件,被移入的控件)
//注意还要添加两个timer ：Return，Next ， Interval = 10
public void Movegroup(string u, Panel p1, Panel p2)
{
if (u == ">") //这是向右，
{
up1 = p1;
up2 = p2;
p2.Visible = true;
p1.Enabled = false;
p2.Enabled = false;
Next.Enabled = true;
}
if (u == "<")
{
up1 = p1;
up2 = p2;
p2.Visible = true;
p1.Enabled = false;
p2.Enabled = false;
Return.Enabled = true;
}
}
Panel up1, up2;
int a = 0;
int b = -580;
int i = 0;
int j = 580;
private void Next_Tick(object sender, EventArgs e)
{
i -= 30;
j -= 30;
up1.Location = new Point(i, up1.Location.Y);
up2.Location = new Point(j, up2.Location.Y);
if (i <= -580 || j <= 0)
{
Next.Enabled = false;
up2.Enabled = true;
up1.Enabled = false;
up1.Visible = false;
i = 0;
j = 580;
}
}
private void Return_Tick(object sender, EventArgs e)
{
a += 30;
b += 30;
up1.Location = new Point(a, up1.Location.Y);
up2.Location = new Point(b, up2.Location.Y);
if (a >= 580 || b >= 0)
{
Return.Enabled = false;
up2.Enabled = true;
up1.Visible = false;
up1.Enabled = false;
a = 0;
b = -580;
}
}

加密原理：

密码+问题+答案的md5 +“/”+加密后的串 组成一个文本文件，（二进制更好了）

解密原理：

先分离出文件里的 密码+问题+答案的md5在与用户输入的密码+问题+答案的md5对比

如果相符则 以此密码解密文件

如果不相符则 提示密码问题及答案错误

我使用DES加密，这是一个类

复制代码 代码如下:
namespace Pd_kernel
{
public class Encrypt
{
/// <summary>
/// 进行DES加密。
/// </summary>
/// <param name="pToEncrypt">要加密的字符串。</param>
/// <param name="sKey">密钥，且必须为8位。</param>
/// <returns>以Base64格式返回的加密字符串。</returns>
public static string DESEncrypt(string pToEncrypt, string sKey)
{
using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
{
byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Convert.ToBase64String(ms.ToArray());
ms.Close();
return str;
}
}

/// <summary>
/// 进行DES解密。
/// </summary>
/// <param name="pToDecrypt">要解密的以Base64</param>
/// <param name="sKey">密钥，且必须为8位。</param>
/// <returns>已解密的字符串。</returns>
public static string DESDecrypt(string pToDecrypt, string sKey)
{
byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
{
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return str;
}
}

public static string MD5encrypt(string text, string method)
{
string strMD5 = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(text, method);
return strMD5;
}
}
}