using System;
using System.Threading;

class MainClass
{
    public static void Main()
    {
        int firstInt = 25;
        int secondInt = 80;

        Console.WriteLine("firstInt initial value = {0}", firstInt);
        Console.WriteLine("secondInt initial value = {0}", secondInt);

        Interlocked.CompareExchange(ref firstInt, 50, secondInt);

        Console.WriteLine("firstInt after CompareExchange = {0}", firstInt);
        Console.WriteLine("secondInt after CompareExchange = {0}", secondInt);
    }
}

    

   
 

using System;
using System.Threading;

class MainClass
{
    public static void Main()
    {
        int firstInt = 25;
        int secondInt = 80;

        Console.WriteLine("firstInt initial value = {0}", firstInt);
        Console.WriteLine("secondInt initial value = {0}", secondInt);

        Interlocked.Exchange(ref secondInt, firstInt);

        Console.WriteLine("firstInt after Exchange = {0}", firstInt);
        Console.WriteLine("secondInt after Exchange = {0}", secondInt);

    }
}

    

   
 

using System;
using System.Threading;

class MainClass
{
    public static void Main()
    {
        int firstInt = 25;
        int secondInt = 80;

        Console.WriteLine("firstInt initial value = {0}", firstInt);
        Console.WriteLine("secondInt initial value = {0}", secondInt);

        Interlocked.Add(ref firstInt, secondInt);

        Console.WriteLine("firstInt after Add = {0}", firstInt);
        Console.WriteLine("secondInt after Add = {0}", secondInt);

    }
}

    

   
 

using System;
using System.Threading;

class MainClass
{
    public static void Main()
    {
        int firstInt = 25;
        int secondInt = 80;

        Console.WriteLine("firstInt initial value = {0}", firstInt);
        Console.WriteLine("secondInt initial value = {0}", secondInt);

        Interlocked.Increment(ref secondInt);

        Console.WriteLine("secondInt after increment = {0}", secondInt);

    }
}

    

   
 

using System;
using System.Threading;

class MainClass
{
    public static void Main()
    {
        int firstInt = 25;
        int secondInt = 80;

        Console.WriteLine("firstInt initial value = {0}", firstInt);
        Console.WriteLine("secondInt initial value = {0}", secondInt);

        Interlocked.Decrement(ref firstInt);

        Console.WriteLine("firstInt after decrement = {0}", firstInt);


    }
}

    

   
 
using System;
using System.Runtime.InteropServices;
using System.Text;

class MainClass {
    [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileString")]
    private static extern int GetPrivateProfileString(string lpAppName, string lpKeyName, string lpDefault, StringBuilder lpReturnedString, int nSize, string lpFileName);
    [DllImport("kernel32.dll", EntryPoint = "WritePrivateProfileString")]
    private static extern bool WritePrivateProfileString(string lpAppName, string lpKeyName, string lpString, string lpFileName);

    static void Main(string[] args) {
        string val;
        val = GetIniValue("A", "Key1", "initest.ini");
        Console.WriteLine(val);
        WriteIniValue("B", "Key1", "New Value", "initest.ini");

        val = GetIniValue("C", "Key1", "initest.ini");
        Console.WriteLine(val);

        WriteIniValue("D", "Key1", "Value1", "initest.ini");
    }

    public static string GetIniValue(string section, string key, string filename) {
        int chars = 256;
        StringBuilder buffer = new StringBuilder(chars);
        string sDefault = "";
        if (GetPrivateProfileString(section, key, sDefault,
          buffer, chars, filename) != 0) {
            return buffer.ToString();
        } else {
            return null;
        }
    }

    public static bool WriteIniValue(string section, string key, string value, string filename) {
        return WritePrivateProfileString(section, key, value, filename);
    }
}

    

using System;
using System.IO;
using System.Security;
using System.Security.Cryptography;

public class StoreCryptoStream : ICryptoStream {
static byte[] tag1 = {(byte)'[',(byte)'S',(byte)'a',(byte)'u' ,(byte)'d' ,(byte)'e',(byte)'s' ,(byte)']'};
static byte[] tag2 = {(byte)'[',(byte)'S',(byte)'a',(byte)'u' ,(byte)'r' ,(byte)'c',(byte)'2' ,(byte)']'};

FileStream fs;

public StoreCryptoStream(FileStream fout) {
fs = fout;
}

public virtual void CloseStream() { fs.Close(); }
public virtual void CloseStream(Object obj) { fs.Close(); }
public virtual void SetSink(ICryptoStream pstm) { }
public virtual void SetSource(CryptographicObject co) { }
public virtual ICryptoStream GetSink() { return null; }

public virtual void Write(byte[] bin) {
int len = bin.GetLength(0);
Write(bin, 0, len);
}

public virtual void Write(byte[] bin, int start, int len) {
fs.Write(bin, start, len);
}

}

public class MainClass {
static byte[] symKey;
static byte[] symIV;

private static bool GenerateKey(string password) {
int len;
char[] cp = password.ToCharArray();
len = cp.GetLength(0);
byte[] bt = new byte[len];

for (int i = 0; i < len; i++) { bt[i] = (byte)cp[i]; } symKey = new byte[8]; symIV = new byte[8]; SHA1_CSP sha = new SHA1_CSP(); sha.Write(bt); sha.CloseStream(); for (int i = 0; i < 8; i++) { symKey[i] = sha.Hash[i]; } for (int i = 8; i < 16; i++) { symIV[i - 8] = sha.Hash[i]; } return true; } private static void DecryptData(string infile, string outfile) { FileStream fin = new FileStream(infile, FileMode.Open, FileAccess.Read); FileStream fout = new FileStream(outfile, FileMode.OpenOrCreate, FileAccess.Write); fout.SetLength(0); byte[] bin = new byte[4096]; long totlen = fin.Length; long rdlen = 8; int len; SymmetricAlgorithm des = new DES_CSP(); StoreCryptoStream scs = new StoreCryptoStream(fout); SymmetricStreamDecryptor ssd = des.CreateDecryptor(symKey, symIV); ssd.SetSink(scs); scs.SetSource(ssd); while (rdlen < totlen) { len = fin.Read(bin, 0, 4096); ssd.Write(bin, 0, len); rdlen = rdlen + len; } ssd.CloseStream(); fin.Close(); fout.Close(); } public static void Main(string[] args) { GenerateKey(args[0]); DecryptData(args[1], args[2]); } } [/csharp]