Mohanapriya R Mohanapriya R
Updated date Feb 01, 2024
In this article, we will explore the fundamentals of HTML decoding in C#. Learn how to convert HTML-encoded strings to their original form, ensuring a seamless and secure user experience in your web applications.

Understanding HTML Encoding and Decoding:

HTML encoding involves replacing special characters like <, >, &, etc., with their corresponding HTML entities (&lt;, &gt;, &amp;). Decoding, on the other hand, is the reverse process, where HTML entities are converted back to their original characters.

The Need for HTML Decoding:

Consider a scenario where user input is displayed on a webpage. If the input contains HTML entities, rendering them as is might lead to unexpected results or security vulnerabilities. Decoding the HTML entities ensures that the displayed content is user-friendly and secure.

HTML Decoding in C#:

In C#, you can use the System.Net.WebUtility class to decode HTML entities. The HtmlDecode method within this class is specifically designed for this purpose.

using System;

class Program
{
    static void Main()
    {
        // Sample HTML-encoded string
        string encodedString = "Hello &lt;World&gt;";

        // Decode the HTML-encoded string
        string decodedString = System.Net.WebUtility.HtmlDecode(encodedString);

        // Display the original and decoded strings
        Console.WriteLine("Original String: " + encodedString);
        Console.WriteLine("Decoded String : " + decodedString);
    }
}

Output:

Original String: Hello &lt;World&gt;
Decoded String : Hello <World>

In this program, we first define an HTML-encoded string ("Hello &lt;World&gt;"). Using WebUtility.HtmlDecode, we decode this string and store the result in another variable (decodedString). The program then prints both the original and decoded strings, allowing you to observe the transformation.

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