Generate hash of a text

suggest change
public static string TextToHash(string text)
      var sh = SHA1.Create();
      var hash = new StringBuilder();
      byte[] bytes = Encoding.UTF8.GetBytes(text);
      byte[] b = sh.ComputeHash(bytes);
      foreach (byte a in b)
          var h = a.ToString("x2");
      return hash.ToString();

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