Wednesday 15 May 2013

ALL State Management Technique

State Management Technique

 Asp.net web pages are developed are Hyper Text Transfer Protocol based (HTTP). HTTP is a stateless protocol which treats as each request as an independent transaction it is not related to previous transactions. 

There are two types of state management techniques.
  1. Client – side state management techniques.
    • Cookies - – A cookie contains a small bit of information which can be read whenever the user visits the website.
      Cookies Property:
      Domain – Specifies which domain is associated with this cookie. Default is the current domain.

      Expires – Set the expire time for cookies

      Http – To access the cookie value in Java script code.

      Secure – It is set when a cookie is transmitted over SSL.

      Name – Cookie Name

      Value – Cookie value

    • Hidden fields – A hidden field contains the information on the page level.

    • View State – A view state is a built in feature in web controls which contains information for a single user to persist data between the pages is post backs.

    • Query strings – A Query strings is an information send along with the URL.
  2. Server – side state management techniques.

    • Application Objects – An application object store information which is visible across the application and share across the entire application.
      An application objects have two events

    • a) Application_Start – its execute when the application is started.

    • b) Application_End– its execute when the application is ended.

      • Application.Lock(); // Method To Lock Appilcation Object
      Application["myApplication"] = "myApplication"; // To declare Application Object
      Application.UnLock(); // Method To UnLock Appilcation Object

    • Session Objects – A Session Object is used to store state specific information per client basis and its specific to a particular user.
      A Session object has two events

      a) Session _Start – its execute when the application is started.
      b) Session _End– its execute when the application is ended

      Session.Abandon(); //Cancels the session and fires end event. 
      Session.Clear(); /Session.RemoveAll(); //Clears all contents of the session.
      Session.Remove(string); //Removes the session name supplied.

    • Cache – A cache is stored information on the page level

Cookies Example

MyPage1.aspx


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MyPage1.aspx.cs" Inherits="MyPage1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Button ID="Button1" runat="server" Text="Click" onclick="Button1_Click" />
    </div>
    
    </form>
</body>
</html>

MyPage1.aspx.cs

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

public partial class MyPage1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
HttpCookie cookie = new HttpCookie("MyHttpCookies ");
        Response.Cookies["MyFirstCookies"].Value = "MyCookies";
// Add For Expire Cookie after one day
cookie.Expires = DateTime.Now.AddDays(1);
Response.Redirect("MyPage2.aspx");
    }
}

MyPage2.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MyPage2.aspx.cs" Inherits="MyPage2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:Label ID="lblShowMessage" runat="server"></asp:Label>
<asp:Label ID="lblHTTPShowMessage" runat="server"></asp:Label>

    
    </div>
    </form>
</body>
</html>

MyPage2.aspx.cs

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

public partial class MyPage2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            if (Request.Cookies["MyFirstCookies"] != null)
                lblShowMessage.Text = "Hello," + Request.Cookies["MyFirstCookies"].Value + "!";
            else
                lblShowMessage.Text = "Sorry";

if (Request.Cookies["MyHttpCookies "] != null)
                lblHTTPShowMessage.Text = "Hello," + Request.Cookies["MyHttpCookies "].Value + "!";
            else
                lblHTTPShowMessage.Text = "Sorry";

        }
    }
}


Hidden field Example

MyPage1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MyPage1.aspx.cs" Inherits="MyPage1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Button ID="Button1" runat="server" Text="Click" onclick="Button1_Click" />
<asp:Label ID="lblShowMessage" runat="server"></asp:Label>
<asp:HiddenField ID="HiddenField1" runat="server" />
    </div>
    
    </form>
</body>
</html>

MyPage1.aspx.cs

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

public partial class MyPage1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
HiddenField1.Value = "";
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {

        HiddenField1.Value = "MyHiddenField";
if (HiddenField1.Value != “”)
                lblShowMessage.Text = "Hello," + HiddenField1.Value + "!";
            else
                lblShowMessage.Text = "Sorry";    }
}

View State Example

MyPage1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MyPage1.aspx.cs" Inherits="MyPage1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Button ID="Button1" runat="server" Text="Click" onclick="Button1_Click" />
<asp:Label ID="lblShowMessage" runat="server"></asp:Label>
    </div>
    
    </form>
</body>
</html>


MyPage1.aspx.cs

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

public partial class MyPage1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
ViewState["MyFirstViewState"] = "";        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {

ViewState["MyFirstViewState"] = "MyViewState";if (ViewState["MyFirstViewState"]!= “”)
                lblShowMessage.Text = "Hello," + ViewState["MyFirstViewState"] + "!";
            else
                lblShowMessage.Text = "Sorry";    }
}

Query String Example

MyPage1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MyPage1.aspx.cs" Inherits="MyPage1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Button ID="Button1" runat="server" Text="Click" onclick="Button1_Click" />
    </div>
    
    </form>
</body>
</html>


MyPage1.aspx.cs


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

public partial class MyPage1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {

Response.Redirect("MyPage2.aspx?QueryString='MyFirstQueryString'");    }
}


MyPage2.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MyPage2.aspx.cs" Inherits="MyPage2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:Label ID="lblShowMessage" runat="server"></asp:Label>
    
    </div>
    </form>
</body>
</html>


MyPage2.aspx.cs


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

public partial class MyPage2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            
            if (Request.QueryString["QueryString"] != null)
                lblShowMessage.Text = "Hello," + Request.Cookies["QueryString"].Value + "!";
            else
                lblShowMessage.Text = "Sorry";
           

        }
    }
}


Application Object Example

MyPage1.aspx


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MyPage1.aspx.cs" Inherits="MyPage1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Button ID="Button1" runat="server" Text="Click" onclick="Button1_Click" />
    </div>
    
    </form>
</body>
</html>


MyPage1.aspx.cs

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

public partial class MyPage1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {

        Application["MyFirstApplicationObject"] = "MyApplicationObject";
        Response.Redirect("MyPage2.aspx");
    }
}


MyPage2.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MyPage2.aspx.cs" Inherits="MyPage2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:Label ID="lblShowMessage" runat="server"></asp:Label>
    
    </div>
    </form>
</body>
</html>


MyPage2.aspx.cs

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

public partial class MyPage2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {

            if (Session ["MyFirstSessionObject"] != null)
                lblShowMessage.Text = "Hello," + Session["MyFirstSessionObject"] + "!";
            else
                lblShowMessage.Text = "Sorry";




        }
    }
}


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