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Literal control in ASP.NET

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Literal control in ASP.NET

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posted 7/21/2010  by mohit kumar

In this blog I will explain Literal control in ASP.NET.

The Literal control used to display static text on a web page. Literal control is not rendered as a <span> tag like label control. The Literal control doesn’t inherit from WebControl and we can’t apply style to its content because it doesn’t have a style property. There is a Mode property of Literal control.

There are three modes available in literal control –

  1. Encode Mode – If I set Encode Mode, HTML tags and script is treated like text.
  2. PassThrough Mode – If I set PassThrough Mode, HTML tags and script is not treated like text.  The text content is rendered as is.
  3. Transform Mode – If I set Transform Mode, Text content is converted to match the markup language of the requested browser. If the markup language is HTML or XHTML, the content is pass through to the browser. For other markup languages, invalid tags are removed. 
Below I am giving an example where I used these modes in Literal control –
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="LiteralMode.aspx.cs" Inherits="LiteralMode" %>

<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Literal ID="Literal1" runat="server" Mode="Encode" ></asp:Literal><br />
        <asp:Literal ID="Literal2" runat="server" Mode="PassThrough"></asp:Literal><br />
        <asp:Literal ID="Literal3" runat="server" Mode="Transform"></asp:Literal>
    </div>
    </form>
</body>
</html>



using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class LiteralMode : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Literal1.Text= "My name is <b>Mohit</b>.<script>alert('Hello World');</script>";
        Literal2.Text = "My name is <b>Mohit</b>.<script>alert('Hello World');</script>";
        Literal3.Text = "My name is <b>Mohit</b>.<script>alert('Hello World');</script>";
    }
}

Output -
Note – If you set Text property of literal control dynamically from user input, it will be a security risk. But with the help of Encode mode, we can encode the HTML and script and display its normal text.
Cheers!!
Happy coding:)

 tags: Literal control in ASP.NET, Mode

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Comments (7)

hajan
Hajan Selmani said:

Nice input! :)

7/22/2010
 · 
Comment
 
by
hajan
Hajan Selmani said:

Nice input! :)

7/22/2010
 · 
Comment
 
by
mohit
mohit kumar said:

Thanks all for your appreciating comments.

7/23/2010
 · 
Comment
 
by
shaitender
Shaitender Singh said:

nice post :)

7/22/2010
 · 
Comment
 
by
raghav_khunger
Raghav Khunger said:

Good one.

7/25/2010
 · 
Comment
 
by
vinay_jss
Vinay Gupta said:

nice post mohit!! keep it up.

7/23/2010
 · 
Comment
 
by
mohit
mohit kumar said:

Thank you Sir.Smile

7/26/2010
 · 
Comment
 
by
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