Asp.Net QueryString Example

QueryString Example In Asp.Net 2.0,3.5,4.0 With Multiple Variable Values Using C# And VB.NET. Several time in ASP.NET applications we need to transfer data or information provided by user from one aspx page to another.

We can achieve this using several methods like Cookies,Session or Crosspage posting

In this post i am explaining how to use querystrings.

Example url with querystring can be something similar like this

http://yourdomainname.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


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

Or 

private void btnGO_Click(object sender, System.EventArgs e)
{
Response.Redirect("Default2.aspx?city=" +
txtData.Text + "&country=" + txtcountry.Text);
}


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

private void Page_Load(object sender,System.EventArgs e)
{
txtCity.Text = Request.QueryString["city"];
txtCountry.Text = Request.QueryString["country"];
}

Or we can also use 

private void Page_Load(object sender,System.EventArgs e)
{
txtCity.Text = Request.QueryString[0];
txtCountry.Text = Request.QueryString[1];
}



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));
}
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