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<h1>ROT13 Encoding in ASP.NET using C# and VB.NET</h1>

This article is based on an article I wrote that described <a
href="rot13_encoding_with_asp.asp">how to encode and decode strings using the ROT13 method
in ASP (VBScript and JScript) and client-side JavaScript</a>. The ROT13 method is a very
old method of encoding (but not encrypting!) text, but given the original
article's popularity I thought it would be useful to update it for the .NET Framework
using both C# and VB.NET.

<h2><a name="VB.NET"></a>ROT13 Encoding Using VB.NET</h2>

In this example, a ROT13 encoding/decoding function is created as a function named ROT13Encode
within a class called TextEncoder. The code for the TextEncoder class is
shown below. The class can be compiled into a binary component file, ROT13Converter.dll by
using the following syntax from the command line:

vbc TextEncoder.vb /out:bin/ROT13Converter.dll /t:library

Alternatively, use VB.NET to compile the dll.


Imports System 
 
Namespace BRETTB 
 
 'Contains methods for encoding (but not encrypting!)
text. 
 Public Class TextEncoder 
 
 'Encodes text using the ROT13
algorithm 
 Public Function
ROT13Encode(InputText As String) As String 
 Dim i As Integer 
 Dim
CurrentCharacter As Char 
 Dim
CurrentCharacterCode As Integer 
 Dim EncodedText
As String = "" 
 
 'Iterate through the
length of the input parameter 
 For i = 0 To InputText.Length - 1 
 'Convert
the current character to a char 
 CurrentCharacter =
System.Convert.ToChar(InputText.Substring(i, 1)) 
 
 'Get
the character code of the current character 
 CurrentCharacterCode
= Microsoft.VisualBasic.Asc(CurrentCharacter) 
 
 'Modify
the character code of the character, - this 
 'so
that "a" becomes "n", "z" becomes "m",
"N" becomes "Y" and so on 
 If
CurrentCharacterCode >= 97 And CurrentCharacterCode <= 109
Then 

CurrentCharacterCode = CurrentCharacterCode + 13 
 
 Else
 
 If CurrentCharacterCode >= 110 And
CurrentCharacterCode <= 122 Then 
 CurrentCharacterCode
= CurrentCharacterCode - 13 
 
 Else 
 If CurrentCharacterCode >= 65 And
CurrentCharacterCode <= 77 Then 

CurrentCharacterCode = CurrentCharacterCode + 13 

 
 Else 

If CurrentCharacterCode >= 78 And
CurrentCharacterCode <= 90 Then 
 CurrentCharacterCode
= CurrentCharacterCode - 13 

End If 
 End If 
 End If 'Add the current
character to the string to be returned 
 End
If 
 EncodedText =
EncodedText + Microsoft.VisualBasic.ChrW(CurrentCharacterCode) 
 Next i 
 
 Return
EncodedText 
 End Function 'ROT13Encode 
 End Class 'TextEncoder 
End Namespace 'BRETTB

Once the code has been compiled, the dll can be placed in the web application's /bin
folder and used using a syntax like this:


Dim TextEncodingObject As New
TextEncoder() 
TextBox1.Text = TextEncodingObject.ROT13Encode(TextBox1.Text)

The <a href="#CodeSamples">code samples</a> contain an example of how to encode and
decode text through a VB.NET web form using ROT13.

<h2><a name="CSharp"></a>ROT13 Encoding Using C#</h2>

In this example, a ROT13 encoding/decoding function is created as a function named ROT13Encode
within a class called TextEncoder. The code for the TextEncoder class is
shown below.


using System; 
 
namespace BRETTB 
{ 
 /// <summary> 
 /// Contains methods for encoding (but not
encrypting!) text. 
 /// </summary> 
 public class TextEncoder 
 { 
 
 ///
<summary> 
 /// Encodes text
using the ROT13 algorithm 
 ///
</summary> 
 /// <param
name="InputText"></param> 
 ///
<returns></returns> 
 public string ROT13Encode(string
InputText) 
 { 
 int
i; 
 char
CurrentCharacter; 
 int
CurrentCharacterCode; 
 string
EncodedText = ""; 
 
 //Iterate
through the length of the input parameter 
 for
(i = 0; i < InputText.Length; i++) 
 { 
 //Convert
the current character to a char 
 CurrentCharacter
= System.Convert.ToChar(InputText.Substring(i, 1)); 

 
 //Get
the character code of the current character 
 CurrentCharacterCode
= (int) CurrentCharacter; 
 
 //Modify
the character code of the character, - this 
 //so
that "a" becomes "n", "z" becomes "m",
"N" becomes "Y" and so on 
 if (CurrentCharacterCode >= 97 && CurrentCharacterCode
<= 109) 
 {
 
 CurrentCharacterCode
= CurrentCharacterCode + 13; 
 } 
 else 
 
 if (CurrentCharacterCode >= 110 && CurrentCharacterCode
<= 122) 
 {
 
 CurrentCharacterCode
= CurrentCharacterCode - 13; 
 } 
 else 
 
 if (CurrentCharacterCode >= 65 && CurrentCharacterCode
<= 77) 
 {
 
 CurrentCharacterCode
= CurrentCharacterCode + 13; 
 } 
 else 
 
 if (CurrentCharacterCode >= 78 && CurrentCharacterCode
<= 90) 
 {
 
 CurrentCharacterCode
= CurrentCharacterCode - 13; 
 }
 
 
 //Add
the current character to the string to be returned 
 EncodedText
= EncodedText + (char) CurrentCharacterCode; 
 } 
 
 return
EncodedText; 
 
 } 
 } 
}

Once the code has been compiled, the dll can be placed in the web application's /bin
folder and used using a syntax like this:

TextEncoder TextEncodingObject = new TextEncoder(); 
TextBox1.Text = TextEncodingObject.ROT13Encode(TextBox1.Text);

The <a href="#CodeSamples">code samples</a> contain an example of how to encode and
decode text through a C# web form using ROT13.

<h2><a name="CodeSamples"></a>Code Samples</h2>

<ul>
<li><a href="http://www.brettb.com/redirector.asp?URL=downloads/ASP.NETRot13Encoding.zip">Download
the code associated with this article</a> (35 K ZIP file).</li>
</ul>

<h2>Further Reading</h2>

<ul>
<li><a href="rot13_encoding_with_asp.asp">ROT13 Encoding using ASP and JavaScript</a>.</li>
</ul>

<ul>
<li>The C# source code was converted to VB.NET with the help of the <a
href="http://www.aspalliance.com/aldotnet/examples/translate.aspx">C# to VB.NET Translator</a>.</li>
</ul>

<ul>
<li>The color coded, syntax highlighted code displayed in this article was created using the
<a href="http://www.winnershtriangle.com/w/Products.ASPNETDocumentationTool.asp"
target="_blank">ASP.NET Documentation Tool</a>.</li>
</ul>

<ul>
<li>The .NET Framework contains an abundance of encryption classes - look for them in System.Security.Cryptography.</li>
</ul>
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