Response.Redirect true and Response.Redirect False in Asp.Net

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>  
  
<!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 id="Head1" runat="server">  
    <title>Article by Vithal Wadje</title>  
</head>  
<body bgcolor="blue">  
    <form id="form2" runat="server">  
    <h4 style="color: White;">  
        Article for C#Corner  
    </h4>  
    <div>  
    </div>  
    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Redirect" />  
    </form>  
</body>  
</html>

Now open the default.aspx page and write the following code on button click event are as

protected void Button1_Click(object sender, EventArgs e)  
{  
    //store string in session which will be accessed on next page  
    Session["BeforeMsg"] = "Code written Before page Redirecting";  
  
    //Redirectig page  
    Response.Redirect("GetData.aspx",true);  
  
    //store string in session which will be accessed on next page  
    Session["after"] = "code written after page Redirecting";  
}

Code explanation

In the above code sample ,we are calling response.Redirect method and before and also after Response.Redirect method ,we are storing one sting message to the session which will accessed on another page.

The above code will not be execute the code written after the Response.Redirect method because we are ing true values in Response.Redirect method which means terminate the current page execution and redirect to the GetData.aspx page.

Now open DetData.aspx.cs Page and write the following code on page load as

protected void Page_Load(object sender, EventArgs e)  
{  
    //accessing the session value which is written before redirecting page  
    Response.Write(Session["BeforeMsg"] + "</br>");  
  
    //accessing the session value which is written after redirecting page  
    Response.Write(Convert.ToString(Session["after"]));     
}

Code explanation

In the above code sample, we are accessing the session values which are stored in session before and after page redirecting.

Whole code of the default.aspx.cs and GetData,aspx.cs will be as follows :

default.aspx.cs

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Web;  
using System.Web.UI;  
using System.Web.UI.WebControls;  
using System.Text;  
public partial class _Default : System.Web.UI.Page  
{  
    protected void Page_Load(object sender, EventArgs e)  
    {  
  
    }  
    protected void Button1_Click(object sender, EventArgs e)  
    {  
        //store string in session which will be accessed on next page  
        Session["BeforeMsg"] = "Code written Before page Redirecting";  
  
        //Redirectig page  
        Response.Redirect("GetData.aspx",true);  
  
        //store string in session which will be accessed on next page  
        Session["after"] = "code written after page Redirecting";  
    }  
}

GetData,aspx.cs

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Web;  
using System.Web.UI;  
using System.Web.UI.WebControls;  
  
public partial class GetData : System.Web.UI.Page  
{  
    protected void Page_Load(object sender, EventArgs e)  
    {  
        //accessing the session value which is written before redirecting page  
        Response.Write(Session["BeforeMsg"] + "</br>");  
  
        //accessing the session value which is written after redirecting page  
        Response.Write(Convert.ToString(Session["after"]));         
    }  
}

Now run the application then the page will look like as follows

Now click on above button then the Page will be redirected to the Next page that is GetData.aspx page as

In the above image you have seen that only session value is displayed which is set before the Response.Redirect method because we used true value in Response.Redirect("GetData.aspx",true) method so the current page execution is terminated and redirected to the next page instead of executing code which is written after the Response.Redirect method.

Now let us change in code which will execute the code which is written after the Response.Redirect as

protected void Button1_Click(object sender, EventArgs e)  
{  
    //store string in session which will be accessed on next page  
    Session["BeforeMsg"] = "Code written Before page Redirecting";  
  
    //Redirectig page  
    Response.Redirect("GetData.aspx",false);  
  
    //store string in session which will be accessed on next page  
    Session["after"] = "code written after page Redirecting";
}

Now run the application and click on Redirect button, it will shows the following output

In the above image you have seen that both session values are displayed which are set before and after the Response.Redirect method because we used false value in Response.Redirect("GetData.aspx",false) method so the current page execution not terminated and it execute code which is written after the Response.Redirect method and then redirect the page to the GetData.aspx

From all above explanation we have learned the difference between the true and false property and also when to use true and false in the Response.Redirect method.

Notes

• Download the Zip file from the attachment for the full source code of the application.

Summary

I hope this article is useful for all readers, if you have any suggestion then please contact me including beginners also.