How to write everything in a textbox to a byte array?

Question

C++ / C#

I write in the text box this is
00 03 01 00 00 0C
how to make it write in 2 digits in each index for example
k[0]=00
k[1]= 03
and so on

Answer 1

var hexText = "7586487389962e";
        var binaryText = StringToByteArray(hexText);

        public static byte[] StringToByteArray(string hex)
        {
            return Enumerable.Range(0, hex.Length)
                             .Where(x => x % 2 == 0)
                             .Select(x => Convert.ToByte(hex.Substring(x, 2), 16))
                             .ToArray();
        }