Asp.Net QueryString Example

In this post i am explaining how to use querystrings.

Example url with querystring can be something similar like this

http://yahoo.com/defauld.aspx?variable1=value1&variable2=value2

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

1private void btnGO_Click(object sender, System.EventArgs e)

2{

3Response.Redirect("Default2.aspx?Value=" +

4txtData.Text);

5}

Or

1private void btnGO_Click(object sender, System.EventArgs e)

2{

3Response.Redirect("Default2.aspx?city=" +

4txtData.Text + "&country=" + txtcountry.Text);

5}

Now to retrieve these values on other page we need to use request.querystring, we can either retrieve them by variable name or by index

1private void Page_Load(object sender,System.EventArgs e)

2{

3txtCity.Text = Request.QueryString["city"];

4txtCountry.Text = Request.QueryString["country"];

5}

Or we can also use

1private void Page_Load(object sender,System.EventArgs e)

2{

3txtCity.Text = Request.QueryString[0];

4txtCountry.Text = Request.QueryString[1];

5}

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

1private void btnGO_Click(object sender, System.EventArgs e)

2{

3Response.Redirect("Default2.aspx?Value=" +

4txtData.Text.Replace(" ","%20");

5}

Or we can use Server.UrlEncode method

1private void btno_Click(object sender, System.EventArgs e)

2{

3Response.Redirect("Default2.Aspx?" +

4"Name=" + Server.UrlEncode(txtData.Text));

5}