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Query Strings in ASP.NET

By xrmlabs webmaster on 2/21/2013

The Query string is a common way of passing data or "Query Parameter" to a web page. The web page can receive this parameter and react accordingly. A Query string can be a search keyword or a page number or something similar. Query string values are appended to the end of the web page URL. They start with a question mark (?) followed by the query string term (or parameter name) followed by an equal sign (=) and the given parameter’s value. You can add as many query parameters as you like. However the next parameter will be delimited with an ampersand (&). Now lets dive into the code to under stand it much better

 Default.aspx

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="Default.aspx.cs" Inherits="ClientQueryString._Default" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <table>
    <tr>
    <td>
    <asp:HyperLink ID="Hyperlink1" runat="server">Count Query Clicksasp:HyperLink>
    td>
    <td>
    <asp:Label ID="lbldisplaymessage1" runat="server" >asp:Label>
    td>
    tr>    
    table>  
asp:Content>

In the code behind file

 

Default.aspx.cs

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
  
namespace ClientQueryString
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                //read the query string
                int queryClicks;
                if (Request.QueryString["clicks"] != null)
                {
                    queryClicks = int.Parse(Request.QueryString["clicks"]) + 1;
                }
                else
                {
                    queryClicks = 1;
                }
  
                //define the query string in the hyperlink 
                Hyperlink1.NavigateUrl += "?clicks=" + queryClicks.ToString();
  
                lbldisplaymessage1.Text = "Query clicks: " + queryClicks.ToString();
            }
        }
    }
}

The output screen shot of the above  program

                             

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