/// <summary>
        /// Calculates the SHA1 hash of the supplied string and returns a base 64 string.
        /// </summary>
        /// <param name="stringToHash">String that must be hashed.</param>
        /// <returns>The hashed string or null if hashing failed.</returns>
        /// <exception cref="ArgumentException">Occurs when stringToHash or key is null or empty.</exception>
        public static string GetSHA1Hash(this string stringToHash)
            if (string.IsNullOrEmpty(stringToHash))
                throw new ArgumentException("An empty string value cannot be hashed.");

            Byte[] data = System.Text.Encoding.UTF8.GetBytes(stringToHash);
            Byte[] hash = new SHA1CryptoServiceProvider().ComputeHash(data);
            return Convert.ToBase64String(hash);
"Get the hash of this string".GetSHA1Hash()


Calculates the SHA1 hash value of a string and returns it as a base64 string.


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