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Explain Querystring in asp.net with example

Introduction: In this article today I am going to explain Querystring in asp.net with example

Description:

Querystring is a way to passing data from one page to another page through the URL. Data that is append to end of a page URL. We pass the information from one page and on another page can retrieve it.

Advantages:
1. It is supported by all browsers.
2. Querystring is easy to use.
3. Server resources are not required.
4. Extra afford are not needed to code.

Disadvantages:
1. All information is visible to user. Therefore, it is not secure.
2. There is a limit to URL length of 255 characters.

Example:


I have added two webforms to project. One page has textbox and button control. I want to pass the textbox enter value to next page on button click.

HTML markup of First page:
<fieldset style="width:400px">
    <legend>Querystring Example</legend>
    <table>
    <tr><td>Book Name:</td><td>  <asp:TextBox ID="txtname" runat="server"></asp:TextBox></td></tr>
    <tr><td></td><td><asp:Button ID="btnsend" runat="server" Text="Send" onclick="Button1_Click" /></td></tr>    
    </table>
    </fieldset>

On button click write the given code (C#):

protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Redirect("webform2.aspx?bname="+txtname.Text);   
    }

VB:
   Protected Sub Button1_Click(sender As Object, e As System.EventArgs) Handles btnsend.Click
        Response.Redirect("webform2.aspx?bname=" + txtname.Text)

    End Sub
Html Markup of Second page where get the value:

   <table>
    <tr><td>Book Name:</td><td><asp:Label ID="lblbname" runat="server" Text=""></asp:Label></td></tr>
    <tr><td></td><td></td></tr>    
    </table>

Write the below given code to get the value (C#):

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            lblbname.Text = Request.QueryString["bname"];
        }
    }

VB:
  Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
        If Not IsPostBack Then
            lblbname.Text = Request.QueryString("bname").ToString()
        End If

    End Sub

Output:

Querystring in asp.net with example


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