C#

using System;<br />
using System.Windows.Forms;<br />
using System.IO;<br />
<br />
class main {<br />
<br />
[STAThreadAttribute()]<br />
<br />
public static void Main() {<br />
File.Delete("c:\\test");<br />
using (FileSystemWatcher watch = new FileSystemWatcher()) {<br />
watch.Path = "c:\\";<br />
watch.Filter = "test";<br />
watch.Created += new FileSystemEventHandler(OnChanged);<br />
watch.Deleted += new FileSystemEventHandler(OnChanged);<br />
watch.Changed += new FileSystemEventHandler(OnChanged);<br />
watch.EnableRaisingEvents = true;<br />
}<br />
FileStream oFs = new FileStream("c:\\test", FileMode.CreateNew, <br />
FileAccess.ReadWrite);<br />
StreamWriter oWriter = new StreamWriter(oFs);<br />
oWriter.Flush();<br />
oWriter.Close();<br />
oFs.Close();<br />
File.Delete("c:\\test");<br />
Application.Run(new Form());<br />
}<br />
<br />
static void OnChanged(object sender, FileSystemEventArgs e) {<br />
  MessageBox.Show(e.FullPath + e.ChangeType.ToString());<br />
}<br />
}

private void Click(Object sender, EventArgs e)<br />
{<br />
control1.Method();<br />
}

private void Click_button(Object sender, EventArgs e)<br />
{<br />
ChildForm child = new ChildForm();<br />
child.Show;<br />
}

private void InvokeMethodOnControl()<br />
{<br />
Control.Hello = "a value";<br />
control1.Method();<br />
}

<code>
using System;


namespace Statements
{
    class Class1
    {
        public int Value = 0;
    }

    class Test
    {
        static void Main()
        {
            Class1 e = new Class1();
            Class1 f = e;

            e.Value = 1;
            f.Value = 5;
            
            Console.WriteLine(e.Value.ToString() + " " + f.Value.ToString());

            Console.WriteLine((object)e.Value == (object)f.Value);
            Console.WriteLine((object)e == (object)f);
            Console.WriteLine(e == f);
            
            Console.ReadLine();
        }
    }

}
</code>