Simple security helper

SecurityHelper.cs

public static class SecurityHelper
{
    public static string MD5Hash(string input)
    {
        StringBuilder hash = new StringBuilder();
        MD5CryptoServiceProvider md5provider = new MD5CryptoServiceProvider();
        byte[] bytes = md5provider.ComputeHash(new UTF8Encoding().GetBytes(input));

        for (int i = 0; i < bytes.Length; i++)
        {
            hash.Append(bytes[i].ToString("x2"));
        }
        return hash.ToString();
    }
}