Code to encode passwords using the ASP.NET Membership provider method

EncodePassword.cs

// http://dotnetfiddle.net/wBqZSX
using System;
using System.Text;
using System.Security.Cryptography;
					
public class Program
{
	public static void Main()
	{
		Console.WriteLine(EncodePassword("Pa55w0rd", "Gr6NjoLK1t89g4pwjmfC1g=="));
	}

	public static string EncodePassword(string pass, string salt)
	{
		byte[] bytes = Encoding.Unicode.GetBytes(pass);
        	byte[] src = Convert.FromBase64String(salt);
        	byte[] dst = new byte[src.Length + bytes.Length];
        	Buffer.BlockCopy(src, 0, dst, 0, src.Length);
        	Buffer.BlockCopy(bytes, 0, dst, src.Length, bytes.Length);
        	HashAlgorithm algorithm = HashAlgorithm.Create("SHA1");
        	byte[] inArray = algorithm.ComputeHash(dst);
        	return Convert.ToBase64String(inArray);
	}
}