C#

using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace Crypt
{
    class Program
    {
        public static string password;
        static void Main(string[] args)
        {
            Console.Write("Please enter your password: ");
            password = Console.ReadLine();
            string plainKey = "Test key";
            string value = "Test value";
            MyDictionary myDictionary = new MyDictionary();
            Console.WriteLine("Adding key: " + plainKey);
            myDictionary.AddItem(plainKey, value);
            Console.WriteLine("Looking for " + plainKey.Encrypt(password));
            Console.WriteLine("Found :" + myDictionary.ContainsKey(plainKey.Encrypt(password)));
            Console.WriteLine("Dictionary contents:");
            foreach (KeyValuePair<string, string> entry in myDictionary)
            {
                Console.WriteLine("Encrypted: " + entry.Key);
                Console.WriteLine("Decrypted: " + entry.Key.Decrypt(password));
            }
            Console.ReadKey();
        }
    }

    class MyDictionary : SortedDictionary<string, string>
    {
        public void AddItem(string plainKey, string value)
        { this.Add(plainKey.Encrypt(Program.password), value); }
    }

    public static class Extensions
    {
        public static string Encrypt(this string str, string password)
        {
            RijndaelManaged cipher = new RijndaelManaged();
            byte[] plainText = System.Text.Encoding.Unicode.GetBytes(str);
            byte[] salt = Encoding.ASCII.GetBytes(password.Length.ToString());
            cipher.Padding = PaddingMode.ISO10126;
            PasswordDeriveBytes key = new PasswordDeriveBytes(password, salt);
            ICryptoTransform encryptor = cipher.CreateEncryptor(key.GetBytes(32), key.GetBytes(16));
            MemoryStream memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
            cryptoStream.Write(plainText, 0, plainText.Length);
            cryptoStream.FlushFinalBlock();
            byte[] cipherBytes = memoryStream.ToArray();
            memoryStream.Close();
            cryptoStream.Close();
            return Convert.ToBase64String(cipherBytes);
        }
        public static string Decrypt(this string str, string password)
        {
            try
            {
                RijndaelManaged cipher = new RijndaelManaged();
                byte[] encryptedText = Convert.FromBase64String(str);
                byte[] salt = Encoding.ASCII.GetBytes(password.Length.ToString());
                cipher.Padding = PaddingMode.ISO10126;
                PasswordDeriveBytes key = new PasswordDeriveBytes(password, salt);
                ICryptoTransform decryptor = cipher.CreateDecryptor(key.GetBytes(32), key.GetBytes(16));
                MemoryStream memoryStream = new MemoryStream(encryptedText);
                CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
                byte[] plainText = new byte[encryptedText.Length];
                int decryptedCount = cryptoStream.Read(plainText, 0, plainText.Length);
                memoryStream.Close();
                cryptoStream.Close();
                return Encoding.Unicode.GetString(plainText, 0, decryptedCount);
            }
            catch
            { return string.Empty; }
        }
    }
}

Le Centriste wrote:

When I contact the web service http://localhost/blabla/blabla.asmx with IE and select teh web method that calls the library method which in turn starts the worker thread, the page blocks until the background thread is finished.

Le Centriste wrote:

When I contact the web service http://localhost/blabla/blabla.asmx with IE and select teh web method that calls the library method which in turn starts the worker thread, the page blocks until the background thread is finished.

Determines whether this instance of System.String and a specified object, which must also be a System.String object, have the same value.

ListBox listBox = new ListBox();
listBox.Items.Add("a");
string x = "a";
Console.WriteLine(x.Equals(listBox.Items[0]));

netJP12L wrote:

string str="aa";
if(str=="aa")
{

}

string str="aa";
if(str.Equals("aa")){
}