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csv - Convert a Hex String to comma separated Hex String c#

I want to input a series of Hex numbers into a textBox and when the user hits a button separate each byte with a comma. AAFFBCEE becomes AA,FF,BC,EE (no comma on last byte). how can I convert a string value to this format?

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    string temp = "aaff4455";
    string temp2 = "";
    int size = temp.Length;

    for (int i = 0; i < size; i += 2)
    {
        temp2 += temp.Substring(i, 2);
        if ((i+2) < size)
            temp2 += ",";
    }

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