dimanche 19 avril 2015

Something strange with ASP.Net Webforms

I tried something by mistake and i do not understand why this is working:


I've created 2 asp.net web forms called page1.aspx and page2.aspx


On page1.aspx:



  • In code behind i declare a static string: field1.

  • I put a simple button.

  • When I click on this button:

    • field1="Hello world"

    • Response.Redirect("page2.aspx")




On page2.aspx, in Page_load, i display page1.field1 value. When page2.aspx is loaded, page1.aspx should not be loaded in memory. I do not understand why page1.field1 still contains "Hello world value !"


Can anyone explain me why this code works ? Is it a good thing to work this way ? Does asp store static fields in viewstate or session ?


Thanks


Here is page1.aspx:



<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="page1.aspx.cs" Inherits="WebApplication7.page1" %>

<!DOCTYPE html>

<html xmlns="http://ift.tt/lH0Osb">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
</div>
</form>
</body>
</html>


Here is page1.aspx.cs:



using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication7
{
public partial class page1 : System.Web.UI.Page
{
public static string field1;

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

protected void Button1_Click(object sender, EventArgs e)
{
field1 = "Hello world";
Response.Redirect("page2.aspx");
}
}
}


Here is page2.aspx.cs:



using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication7
{
public partial class page2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Response.Write(page1.field1);
}
}
}

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