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How to Convert String to Hexadecimal and Vice versa

Posted by Joshy George Articles | How do I October 31, 2006
This article shows you how to convert string to hexadecimal and vice versa. I did this program for my smart Card application.
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Introduction

This article shows you how to convert string to hexadecimal and vice versa.

I did this program for my smart Card application. Earlier, I was using visual basic coding but this time I have to change my code into C#. Usually smart card application is writing data in hex format. I do not have a good hex converter to help me do those conversions that's why I made this.

Using the code

The main code used for the conversion is from the Microsoft.VisualBasic class. Below is the code that is used to convert a string to hexadecimal format. We can't direct convert all characters in to hexadecimal format (eg:@#$%^&*()) that's why firstly I take ASCII value of the character, and then convert ASCII value into hexadecimal format.

 

//For this I made while loop

while (Data.Length > 0)
{

//first I take each character using substring

sValue= Data.Substring(0, 1).ToString() 

//then convert character into ascii.        

sValue= Strings.Asc(sValue) 

//then convert ascii value into Hex Format 

sValue = Conversion.Hex(sValue) 

//after converting remove the character. 

Data = Data.Substring(1, Data.Length - 1);

sHex = sHex + sValue;

} 

 

Ony two functions I used for this application

      

Data_Hex_Asc(data)

 

(This Function for Converting data into hex format

 

public string Data_Hex_Asc(ref string Data)

{

    string Data1 = "";

    string sData = "";

    while (Data.Length > 0)

    //first take two hex value using substring.

    //then convert Hex value into ascii.

    //then convert ascii value into character.

    {
        Data1 = System.
Convert.ToChar(System.Convert.ToUInt32(Data.Substring(0, 
2),  16)).ToString();

        sData = sData + Data1;

         Data = Data.Substring(2, Data.Length - 2);

    }
   
return sData;
}

 

Data_Asc_Hex(data)

 

(This Function for Converting hex into data )

 

public string Data_Asc_Hex(ref string Data)
{
   
//first take each charcter using substring.
    //then convert character into ascii.
    //then convert ascii value into Hex Format
   
string sValue;
   
string sHex = "";
   
while (Data.Length > 0)
    {
        sValue =
Conversion.Hex(Strings.Asc(Data.Substring(0, 1).ToString()));
        Data = Data.Substring(1, Data.Length - 1);
        sHex = sHex + sValue;
    }
   
return sHex;
}

Article Extensions
Contents added by vadmal on Jan 07, 2010
Download File: HexConverter.zip
Hey Joshy,

I rewrote the code and took out the dependency on the Microsoft.VisualBasic DLL.
This is for the C# purists out there!

Thanks for your article!

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