Data Transfer to other aspx pages using Query String Session cookies and cross page posting

Posted by in ASP.NET category on for Intermediate level | Views : 12023 red flag

Several time while developing asp .NET applications we need to transfer daa from
one page to another, we can achieve this by several methods , some of them are

1. Using Query String

2. Using Cookies

3. Using Session Variables

4. Using Cross Page Posting

5 . Using Server.Transfer
1 . QueryStrings 
Suppose we have a textbox txtData and we want it's value on other page
than in code behind we would write in click event of btnGo

private void btnGO_Click(object sender, System.EventArgs e)
Response.Redirect("Default2.aspx?Value=" +txtData.Text);

To retrieve this value on second page

private void Page_Load(object sender, System.EventArgs e)
txtData.Text = Request.QueryString["Value"];

If we have passed more than one values in querystring we can either retrieve them by variable name or by index

private void Page_Load(object sender,System.EventArgs e)
txtData.Text = Request.QueryString[0];

QueryString can't be used for sending long data because it has a max lenght limit.

Data being transferred is visible in url of browser.

To use spaces and & in query string we need to replace space by %20 and & by %26

private void btnGO_Click(object sender, System.EventArgs e)
Response.Redirect("Default2.aspx?Value=" +
txtData.Text.Replace(" ","%20");

Or we can use Server.UrlEncode method

private void btno_Click(object sender, System.EventArgs e)
Response.Redirect("Default2.Aspx?" +
"Name=" + Server.UrlEncode(txtData.Text));

2. Data Transfer Using Cookies
Cookies are stored in client machine and can have max size of 4kb
To store value from textbox

protected void btnGo_Click(object sender, EventArgs e)
HttpCookie MyCookie = new HttpCookie("Data");
MyCookie.Value = txtData.Text;
MyCookie.Expires = DateTime.Now.AddDays(1);

And to retrieve data from cookie in Deault2.aspx page
In the Page_Load event write
String strData = Request.Cookies["Data"].Value);
3. Data Transfer using Session Variables
Storing and retrieving Data to and from
session variables on the page we want
To store a value in session we need to write

protected void btnGo_Click(object sender, EventArgs e)
Session["VariableName"] = txtData.Text;

To retrieve value from Session on other page

string strData = Session["VariableName"].ToString();

Don't forget to use proper typecasting as session stores data as Object and we need to change it to desired type.

To remove Session Variables use

Session.Contents.Remove("VariableName"); or
Session.Contents.RemoveAll(); or

Please read my next article to know about cross paging and server.transfer method at

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