[C#] An interface to the .NET SHA256 hashing function.

mySHA.cs

using System;
using System.Security.Cryptography;
using System.Text;

namespace Hashing
{
    /// <summary>
    // mySHA provides an interface to the SHA256 hashing function.
    /// </summary>
    public static class mySHA
    {
        /// <summary>
        /// Computes the SHA256 hash value of the input string.
        /// </summary>
        /// <param name="String">UTF-16 encoded.</param>
        /// <returns>Returns a Base64 representation of the hash bytes.</returns>
        public static string ComputeHash(string String)
        {
            using (SHA256Managed sha = new SHA256Managed())
            {
                byte[] hashBytes = sha.ComputeHash(Encoding.UTF8.GetBytes(String), 0,
                    Encoding.UTF8.GetByteCount(String));

                return Convert.ToBase64String(hashBytes);
            }
        }

        /// <summary>
        /// Computes the SHA256 hash value of the input string.
        /// The output string will be the hash value of the Salt+String+Salt.
        /// </summary>
        /// <param name="String">UTF-16 encoded.</param>
        /// <returns>Returns a Base64 representation of the hash bytes.</returns>

        public static string ComputeHash(string String, string Salt)
        {
            try
            {
                return ComputeHash(Salt + String + Salt);
            }
            catch (Exception)
            {
                throw;
            }
        }

    }
}