hash c# code example

Example 1: c# hashtable

using System;
using System.Collections;

namespace CollectionsApplication {
   class Program {
      static void Main(string[] args) {
         Hashtable ht = new Hashtable();
         
         ht.Add("001", "Zara Ali");
         ht.Add("002", "Abida Rehman");
         ht.Add("003", "Joe Holzner");
         ht.Add("004", "Mausam Benazir Nur");
         ht.Add("005", "M. Amlan");
         ht.Add("006", "M. Arif");
         ht.Add("007", "Ritesh Saikia");
         
         if (ht.ContainsValue("Nuha Ali")) {
            Console.WriteLine("This student name is already in the list");
         } else {
            ht.Add("008", "Nuha Ali");
         }
         
         // Get a collection of the keys.
         ICollection key = ht.Keys;
         
         foreach (string k in key) {
            Console.WriteLine(k + ": " + ht[k]);
         }
         Console.ReadKey();
      }
   }
}

Example 2: hash string c#

static string HashString(string text, string salt = "")
{
    if (String.IsNullOrEmpty(text))
    {
        return String.Empty;
    }
    
    // Uses SHA256 to create the hash
    using (var sha = new System.Security.Cryptography.SHA256Managed())
    {
        // Convert the string to a byte array first, to be processed
        byte[] textBytes = System.Text.Encoding.UTF8.GetBytes(text + salt);
        byte[] hashBytes = sha.ComputeHash(textBytes);
        
        // Convert back to a string, removing the '-' that BitConverter adds
        string hash = BitConverter
            .ToString(hashBytes)
            .Replace("-", String.Empty);

        return hash;
    }
}