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Encoding and Decoding in ASP.Net


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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:

Encoding and Decoding in ASP.Net

And

Encoding and Decoding in ASP.Net

Example:

string strData="?data??";       

Response.Write(Server.HtmlEncode(strData)); //Encode the value here

Server.HtmlDecode()

Syntax:

Encoding and Decoding in ASP.Net

And

Encoding and Decoding in ASP.Net

Example:

string strData="?data??";       

Response.Write(Server.HtmlDecode(strData)); //Decode the value here

Server.HtmlUrlEncode()

This function is used for encode the URL

Syntax:

Encoding and Decoding in ASP.Net

 

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("<font color='green'>URL is:</font> " + strUrl +"<br/>");

Response.Write("<font color='green'>Encoded URL is: </font>" + HttpUtility.UrlEncode(strUrl));//Encoded Url Here

 

Output:

Encoding and Decoding in ASP.Net

 

Server.HtmlUrlDecode ()

This function is used for decode the encoded URL

Syntax:

Encoding and Decoding in ASP.Net

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("<font color='green'>URL is:</font> " + strUrl +"<br/>");

Response.Write("<font color='green'>Encoded URL is: </font>" + HttpUtility.UrlEncode(strUrl) + "<br/>");//Encoded Url Here

Response.Write("<font color='green'>Decoded URL is: </font>" + HttpUtility.UrlDecode(HttpUtility.UrlEncode(strUrl)));//Decoded Url Here

 

Output:

Encoding and Decoding in ASP.Net

 

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:

<p><%=Server.HtmlEncode(strData); %> or

<%=HttpUtility.UrlEncode(strData); %></p>

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.


Thanks..

By Manish Sahu on   one month ago

Thanks for sharing informative post.

Your words increase my knowledge for sure. Thanks


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