C#

private int _size;







public int Size {



  get {



    return _size;



  }



  set {



    if (value < 0)



      _size = 0;



    else



      _size = value;



  }



} 















foo.Size++;

Delegates / Events

VB.NET

Delegate Sub MsgArrivedEventHandler(ByVal message



As String) 











Event MsgArrivedEvent As MsgArrivedEventHandler 











'or to define an event which declares a



'delegate implicitly



Event MsgArrivedEvent(ByVal message As String) 











AddHandler MsgArrivedEvent, AddressOf My_MsgArrivedCallback



'Won't throw an exception if obj is Nothing



RaiseEvent MsgArrivedEvent("Test message")



RemoveHandler MsgArrivedEvent, AddressOf My_MsgArrivedCallback















Imports System.Windows.Forms 











'WithEvents can't be used on local variable



Dim WithEvents MyButton As Button



MyButton = New Button 











Private Sub MyButton_Click(ByVal sender As System.Object, _



  ByVal e As System.EventArgs) Handles MyButton.Click



  MessageBox.Show(Me, "Button was clicked", "Info", _



    MessageBoxButtons.OK, MessageBoxIcon.Information)



End Sub

C#

delegate void MsgArrivedEventHandler(string message); 











event MsgArrivedEventHandler MsgArrivedEvent; 











//Delegates must be used with events in C#











MsgArrivedEvent += new MsgArrivedEventHandler



  (My_MsgArrivedEventCallback);



//Throws exception if obj is null



MsgArrivedEvent("Test message");



MsgArrivedEvent -= new MsgArrivedEventHandler



  (My_MsgArrivedEventCallback); 















using System.Windows.Forms; 











Button MyButton = new Button();



MyButton.Click += new System.EventHandler(MyButton_Click); 











private void MyButton_Click(object sender, 
   System.EventArgs e) {



  MessageBox.Show(this, "Button was clicked", "Info",



    MessageBoxButtons.OK, MessageBoxIcon.Information);



}

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