Converting long string of binary to hex c#

Question

I\'m looking for a way to convert a long string of binary to a hex string.

the binary string looks something like this \"01100110100101110010011101010111001101

Answer 1

I came up with this method. I am new to programming and C# but I hope you will appreciate it:

static string BinToHex(string bin)
{
    StringBuilder binary = new StringBuilder(bin);
    bool isNegative = false;
    if (binary[0] == '-')
    {
        isNegative = true;
        binary.Remove(0, 1);
    }

    for (int i = 0, length = binary.Length; i < (4 - length % 4) % 4; i++) //padding leading zeros
    {
        binary.Insert(0, '0');
    }

    StringBuilder hexadecimal = new StringBuilder();
    StringBuilder word = new StringBuilder("0000");
    for (int i = 0; i < binary.Length; i += 4)
    {
        for (int j = i; j < i + 4; j++)
        {
            word[j % 4] = binary[j];
        }

        switch (word.ToString())
        {
            case "0000": hexadecimal.Append('0'); break;
            case "0001": hexadecimal.Append('1'); break;
            case "0010": hexadecimal.Append('2'); break;
            case "0011": hexadecimal.Append('3'); break;
            case "0100": hexadecimal.Append('4'); break;
            case "0101": hexadecimal.Append('5'); break;
            case "0110": hexadecimal.Append('6'); break;
            case "0111": hexadecimal.Append('7'); break;
            case "1000": hexadecimal.Append('8'); break;
            case "1001": hexadecimal.Append('9'); break;
            case "1010": hexadecimal.Append('A'); break;
            case "1011": hexadecimal.Append('B'); break;
            case "1100": hexadecimal.Append('C'); break;
            case "1101": hexadecimal.Append('D'); break;
            case "1110": hexadecimal.Append('E'); break;
            case "1111": hexadecimal.Append('F'); break;
            default:
                return "Invalid number";
        }
    }

    if (isNegative)
    {
        hexadecimal.Insert(0, '-');
    }

    return hexadecimal.ToString();
}