How to Convert String to Hexadecimal and Vice versa

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.VisualBasicclass. 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;
}

Only 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;
}