using System;  

using System.Text;  

using System.Security.Cryptography;  

class Program  

{  

    static void Main(string[] args)  

    {  

        var plainData = "sample_text_123";  

        Console.WriteLine("Raw data: {0}", plainData);  

        var hashedData = ComputeSha256Hash(plainData);  

        Console.WriteLine("Hash {0}", hashedData);  

    }  

​

    static string ComputeSha256Hash(string rawData)  

    {  

        using (var sha256Hash = SHA256.Create())  

        {

            var bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(rawData));  

            var builder = new StringBuilder();  

            for (int i = 0; i < bytes.Length; i++)  

            {  

                builder.Append(bytes[i].ToString("x2"));  

            }  

            return builder.ToString();  

        }  

    }  

​

}