Dror Helper shows how to implement SoundEx in C#:
It’s fairly easy to follow the steps of the algorithm (as defined by Wikipedia):
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Retain the first letter of the name and drop all other occurrences of a, e, I, o, u, y, h, w.
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Replace consonants with digits as follows (after the first letter):
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b, f, p, v → 1
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c, g, j, k, q, s, x, z → 2
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d, t → 3
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l → 4
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m, n → 5
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r → 6
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If two or more letters with the same number are adjacent in the original name (before step 1), only retain the first letter; also two letters with the same number separated by ‘h’ or ‘w’ are coded as a single number, whereas such letters separated by a vowel are coded twice. This rule also applies to the first letter.
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If you have too few letters in your word that you can’t assign three numbers, append with zeros until there are three numbers. If you have more than 3 letters, just retain the first 3 numbers.