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Gravatar UrlHelper
public static class GravatarUrlHelper
public static string GravatarUrl(this UrlHelper urlHelper, string emailAddress, int size = 38, string defaultAvatar = "identicon")
var md5 = MD5.Create();
var hash = md5.ComputeHash(Encoding.ASCII.GetBytes(emailAddress.Trim().ToLowerInvariant()));
return string.Format("{0}?s={1}&d={2}", hash, size, defaultAvatar);
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