C#

<br />
Delegate declaration.<br />
<br />
public delegate void CustomDel(string a);<br />
<br />
event declaration of the type CustomDel<br />
<br />
private event CustomDel CustomDelEvt;<br />
<br />
Adding event handler.<br />
<br />
CustomdelEvt+=new CustomDel(Button_Devevt);<br />
<br />
Handler definision<br />
<br />
private void Button_Devevt(string a)<br />
{<br />
 Messagebox.Show(a);<br />
}<br />

public class test : System.Windows.Forms.Form
{
	Button b, b2;
	public test()
	{
		InitializeComponents();		
	}
	public void InitializeComponents()
	{
		b = new Button();
		b2 = new Button();
		b.Text = "Some text";
		b2.Text = "Some other text";
		b2.Location = new Point(20, 20);
		b.Click += new EventHandler(bClick);
		b2.Click += new EventHandler(bClick);
		this.Controls.AddRange(new Control[] {b, b2});
	}	fs
	private void bClick(object sender, EventArgs e)
	{
		Button b = sender as Button;
		if(b != null)
		{
			//Do what you want here.
			MessageBox.Show(b.Text);
		}
	}		
	[STAThread]
	public static void Main()
	{
		Application.Run(new test());
	}	
}

linkButton1.Click += new EventHandler(OpenMtnStndards);
linkButton2.Click += new EventHandler(OpenMtnStndards);
linkButton3.Click += new EventHandler(OpenMtnStndards);
 
// ...
 
private void OpenMtnStandards(object sender, EventArgs e)
{
  LinkButton lb = sender as LinkButton;
  if (lb != null)
  {
    // Just print the link text. It will be correct for whichever LinkButton
    // was clicked.
    Trace.Warn(lb.Text);
 
    // Identity which LinkButton was clicked by it's ID.
    switch (lb.ID)
    {
      case "lb1":
        Trace.Warn("You clicked LinkButton 1");
        break;
      case "lb2":
        Trace.Warn("You clicked LinkButton 2");
        break;
      case "lb3":
        Trace.Warn("You clicked LinkButton 3");
        break;
    }
  }
 
  // Using referential equality
  if (sender == linkButton1)
    Trace.Warn("You clicked LinkButton number 1");
  else if (sender == linkButton2)
    Trace.Warn("You clicked LinkButton number 2");
  else if (sender == linkButton3)
    Trace.Warn("You clicked LinkButton number 3");
}

Rectangle area = Screen.PrimaryScreen.WorkingArea;
if (Screen.AllScreens.Length > 1)
  area = Screen.AllScreens[1].WorkingArea; // arrays in .NET are 0-based.

string MdbPath
{
  get
  {
    string path = Path.GetDirectoryName(Application.StartupPath);
    return Path.Combine(path, "Data\Database.mdb");
  }
}

[DllImport("user32", EntryPoint = "SendMessage")]<br>public static extern int SendMessageStr(int hWnd, uint Msg, int wParam, [MarshalAs(UnmanagedType.LPStr)] string lParam);