C#

private const Int32 WM_CLOSE = 0x0010;
[DllImport("user32.dll")]
static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

try
{
   //do something
}
catch (Exception e)
{
   throw e;
}

int value = 1989;
string hex = "0x" + value.ToString("x4");

//#!csc.exe /t:exe Test.cs
//
 
using System;
using System.Text;
 
class Test
{
  static void Main()
  {
    byte[] text = Encoding.ASCII.GetBytes("1989");
    byte[] dataArray = new byte[256];
 
    int i = 0xc0;
    dataArray[i++] = 0x31;
    dataArray[i++] = 0x39;
    dataArray[i++] = 0x38;
    dataArray[i++] = 0x39;
 
    bool found = true;
    for (i=0; i<4; i++)
      if (dataArray[0xc0 + i] != text[i])
      found = false;
 
    Console.WriteLine(found);
  }
}

//#!csc.exe /t:exe Test.cs
//
 
using System;
using System.Globalization;
using System.Text;
 
class Test
{
  static void Main()
  {
    byte[] dataArray = new byte[256];
 
    int i = 0xc0;
    dataArray[i++] = 0x31;
    dataArray[i++] = 0x39;
    dataArray[i++] = 0x38;
    dataArray[i++] = 0x39;
 
    byte[] text = new byte[4];
    Array.Copy(dataArray, 0xc0, text, 0, 4);
 
    string s = Encoding.ASCII.GetString(text);
    bool found = string.Compare("1989", s, true,
      CultureInfo.InvariantCulture) == 0;
    Console.WriteLine(found);
  }
}

0xC0 == 192 == \300

using System;
using System.Threading;
using System.Collections;
using System.Windows.Forms;

public class MyClass : Form
{
	Button b;

	private void Initialize()
	{
		this.b = new Button();
		b.Text = "Click Me";
		b.Click += new EventHandler(bClick);
		this.Controls.Add(b);
	}
	
	private void bClick(object sender, EventArgs e)
	{
		b.Enabled = false;
		DoLongProc();
		b.Enabled = true;
	}
	
	private void DoLongProc()
	{
		Thread.Sleep(5000);	
		MessageBox.Show("Done now");
	}
	
	public static void Main()
	{
		MyClass m = new MyClass();
		m.Initialize();
		m.ShowDialog();
	}
}