using System;

using System.Security.Cryptography;

using System.IO;

using System.Text;

public class Program

{

    public static void Main()

    {

        using (SHA256 sha256Hash = SHA256.Create())

                {

                    // ComputeHash

                    byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes("text"));

                    // Converting to base64

                    Console.WriteLine(System.Convert.ToBase64String(bytes));

                }

​

    }

}