Query String

Asp.Net CS By Example 29 February 2020

Query String

In this article we are leanin about ASP.NET Query String. Query String is passed in the URL. They store the value in the form of Key-Value pair. We will have to maintain the Query Strings when we pass it from one page to second page and second page to the third page. when redirecting a request from one page to another page, we can pass the Query String.

C# Code

  http://localhost:1494/FrmQueryString.aspx?
UserName=abc&
Address=xyz

In query strings, values are stored at the end of the URL. These values are visible to the user through his or her browser’s address bar. Query strings are not secure. You should not send secret information through the query string.

Sending Query String

  Response.Redirect("FrmQueryString.aspx?UserName=" + txtUserName.Text + 
",address=" + txtAddress.Text);

Retrieving Query String

  string s = Request.QueryString["UserName"].ToString();

In below Code show how to read value from URL query string.

Code: FrmQueryString.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="FrmQueryString.aspx.cs" 
Inherits="LearnAsp.Net.FrmQueryString" %>

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

Code: FrmQueryString.aspx.cs

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

namespace LearnAsp
{
    public partial class FrmQueryString : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.QueryString.Count>0)
            {
                string UserName = Request.QueryString["UserName"];
                string Address = Request.QueryString["Address"];

                Response.Write("User Name : " + UserName);
                Response.Write("
Address : " + Address);
            }
        }
    }
}

Output:

Thanks for reading Query String

29 February 2020

Query String

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