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;
}