asp.net BasePage class +Session universal user login permission control

But many people like to write code in

protected void Page_Load(object sender, EventArgs e) 
{}

, and even write code in some buttons to determine whether the session exists~~
Of course this can achieve the effect, the problem is, if There are 1000 pages~~You need ctrl+C. . . Ctrl+V many times~~~
My idea is to write a BasePage class that inherits System.Web.UI.Page

public class BasePage : System.Web.UI.Page 
{ 
//pageunload事件，并不是指浏览器关闭，而是指页面关闭，所以刷新的时候，依然会执行以下事件 
protected void Page_Unload(object sender, EventArgs e) 
{ 
} 
protected override void OnPreInit(EventArgs e) 
{ 
base.OnPreInit(e); 
if (!SessionData.IsLogin()) 
{//这里写 跳转到登陆页面：例如： 
Response.Redirect(string.Format("~/ReLogin.aspx?Page={0}", Request.Path)); 
}}

Why do I need to bring the Page parameter here, just to return after successful login? Go to the page before login
In addition, I also contributed a SessionData class:

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using ExpressPlatform.Common; 
namespace ExpressPlatform.Web.AppCode 
{ 
public class SessionKey 
{ 
public const string UserInfo = "user"; 
} 
/// <summary> 
/// 所有session中的数据，在该类管理 
/// </summary> 
public class SessionData 
{ 
/// <summary> 
/// 获取session 中的 用户信息 
/// </summary> 
/// <returns></returns> 
public static MdlSessionCustomerInfo GetUserInfo() 
{ 
MdlSessionCustomerInfo userInfo = SessionManager<MdlSessionCustomerInfo>.GetSessionObject(SessionKey.UserInfo); 
if (userInfo == null) 
{ 
userInfo = new MdlSessionCustomerInfo(); 
//把内容储存到应用程序 
SessionManager<MdlSessionCustomerInfo>.SetSessionObject(SessionKey.UserInfo, userInfo); 
} 
return userInfo; 
} 
/// <summary> 
/// 重新设置session 中的用户信息 
/// </summary> 
/// <param name="userInfo"></param> 
public static void SetUserInfo(MdlSessionCustomerInfo userInfo) 
{ 
SessionManager<MdlSessionCustomerInfo>.SetSessionObject(SessionKey.UserInfo, userInfo); 
} 
/// <summary> 
/// 清楚session中用户信息 
/// </summary> 
public static void ClearUserInfo() 
{ 
SessionManager<MdlSessionCustomerInfo>.SetSessionObject(SessionKey.UserInfo, null); 
} 
/// <summary> 
/// 是否登入 
/// </summary> 
/// <returns></returns> 
public static bool IsLogin() 
{ 
bool ret = false; 
MdlSessionCustomerInfo userInfo = SessionManager<MdlSessionCustomerInfo>.GetSessionObject(SessionKey.UserInfo); 
if (userInfo != null) 
ret = true; 
return ret; 
} 
} 
}

public class BasePage : System.Web.UI.Page

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