Query String in ASP.Net

When working with websites, you often need to pass values from one page to another like data from html page to aspx web forms in context of Asp.Net

For example in first page you collect information about your client, first name and last name and use this information in your second page.

For passing variables content between pages ASP.NET gives us several choices. One choice is using QueryString property of Request Object. When surfing internet you should have seen weird internet address such as one below.

http://www.localhost.com/Webform2.aspx?Firstname=Sumit&LastName=Kesarwani

This html addresses use QueryString property to pass values between pages. In this address you send 3 information.

Webform2.aspx this is the page your browser will go.

Firstname=Sumit you send a Firstname variable which is set to Sumit

LastName=Kesarwani you send a Lastname variable which is set to Kesarwani

As you have guessed ? starts your QueryString, and & is used between variables.

Example

Step 1:-

Design the form as shown below:

 

<div>         <table>             <tr>                 <td>                     Firstname                 </td>                 <td>                     <asp:TextBox ID="txtFirstname" runat="server"></asp:TextBox>                 </td>             </tr>             <tr>                 <td>                     Lastname                 </td>                 <td>                     <asp:TextBox ID="txtLastname" runat="server"></asp:TextBox>                 </td>             </tr>             <tr>                 <td>                 </td>                 <td>                     <asp:Button ID="btnSend" runat="server" Text="Send Values"                         onclick="btnSend_Click" />                 </td>             </tr>         </table>     </div>

 

Step 2:-

Write the following code in webform1.aspx.cs

using System;   namespace QueryStringWebApplication {     public partial class WebForm1 : System.Web.UI.Page     {         protected void Page_Load(object sender, EventArgs e)         {         }         protected void btnSend_Click(object sender, EventArgs e)         {             Response.Redirect("WebForm2.aspx?Firstname=" + txtFirstname.Text + "&Lastname=" + txtLastname.Text);         }     } }

 

Step 3:-

Add another form webform2.aspx

<div>         Firstname : <asp:Label ID="lblFirstname" runat="server"></asp:Label>         <br/>         Lastname : <asp:Label ID="lblLastname" runat="server"></asp:Label>     </div>

 

Step 4:-

Write the following code in webfrom2.aspx.cs file

using System;   namespace QueryStringWebApplication {     public partial class WebForm2 : System.Web.UI.Page     {         protected void Page_Load(object sender, EventArgs e)         {             if (!IsPostBack)             {                 lblFirstname.Text = Request.QueryString["Firstname"];                 lblLastname.Text = Request.QueryString["Lastname"];             }         }     } }

 

Step 5:-

Run the application

After filling the values click on the send values button

It will redirect to you on webform2.aspx page and show the message like this.

And also you can see that the values passed are on the URL.