---
title: "Encoding and Decoding in ASP.Net"
description: "Html Encode method encodes a particular string to be displayed in a browser. It is important to encode strings prior it’s rendering in the page, mai"
author: "Amit Singh"
published: 2010-11-27
updated: 2020-03-04
canonical: https://www.mindstick.com/articles/203/encoding-and-decoding-in-asp-dot-net
category: "asp.net"
tags: ["asp.net"]
reading_time: 2 minutes
---
# Encoding and Decoding in ASP.Net
Html Encode method encodes a particular string to be displayed in a browser. It is important to encode strings prior it’s rendering in the page, mainly to avoid cross-site script injection (XSS) and HTML injection attacks. However, developers so often forget to call the encode function.\
Html Decode method decodes a particular string which is encoded.
##### Encoding and decoding is needed in somewhere like
- Pass the values from one page to another.
- Access the URL or pass the URL.
- Fetch the data or insert data in Database.
- Read the xml data or insert data in xml.
- Change the special character from string
- And security purpose etc.
##### In ASP.Net we used the following encode and decode method:
- Server.HtmlEncode()
- Server.HtmlDecode()
- Server.HtmlUrlEncode()
- Server.HtmlUrlDecode ()
- HttpUtility.UrlEncode()
- HttpUtility.UrlDecode ()
##### How Use these method in ASP.Net
##### Server.HtmlEncode():\
Syntax:
\
And
##### Example:
string strData="?data??";
Response.Write(Server.HtmlEncode(strData)); //Encode the value here
##### Server.HtmlDecode()
##### Syntax:
And
##### Example:
string strData="?data??";
Response.Write(Server.HtmlDecode(strData)); //Decode the value here
##### Server.HtmlUrlEncode()
#####
This function is used for encode the URL
## Syntax:
We pass the other parameter as:
string HttpUtility.UrlEncode(byte[] bytes), string HttpUtility.UrlEncode(byte[] bytes,System.Text.Encoding e)and string HttpUtility.UrlEncode(byte[] bytes,int offset,int count)
##### Example:
```
string strUrl=Request.Url.ToString();//Request.Url get the url Response.Write("URL is: " + strUrl +"
");Response.Write("Encoded URL is: " + HttpUtility.UrlEncode(strUrl));//Encoded Url Here
```
Output:
Server.HtmlUrlDecode ()
This function is used for decode the encoded URL
##### Syntax:
We pass the other parameter as:
string HttpUtility.UrlDecode(byte[] bytes), string HttpUtility.UrlDecode(byte[] bytes,System.Text.Encoding e)and string HttpUtility.UrlDecode(byte[] bytes,int offset,int count)
##### Example:
```
string strUrl=Request.Url.ToString();//Request.Url get the url Response.Write("URL is: " + strUrl +"
");Response.Write("Encoded URL is: " + HttpUtility.UrlEncode(strUrl) + "
");//Encoded Url HereResponse.Write("Decoded URL is: " + HttpUtility.UrlDecode(HttpUtility.UrlEncode(strUrl)));//Decoded Url Here
```
Output:
HttpUtility.UrlEncode() and HttpUtility.UrlDecode ()
Both method work same as to Server.HtmlUrlEncode() and Server.HtmlUrlDecode() respectively.
Note:
In Latest version ASP.Net 4.0, we write the code more concise way
##### Example:
<%=Server.HtmlEncode(strData); %> or
<%=HttpUtility.UrlEncode(strData); %>
But in **Asp.net 4.0** we use as <%: strData %>, it is similar to both
This is the simple concept on encoding and decoding in ASP.Net.
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