C#

<br />
using System;<br />
using System.Runtime.InteropServices;<br />
using System.Windows.Forms;<br />
<br />
public class GetFormsCollection {<br />
<br />
	private delegate bool WndEnumProc(System.IntPtr hWnd , int lParam);<br />
<br />
	[DllImport("user32.dll", CharSet=CharSet.Auto)]<br />
	private static extern bool EnumWindows (WndEnumProc lpEnumFunc, int lParam);<br />
<br />
	public readonly System.Collections.ArrayList Forms;<br />
<br />
	public GetFormsCollection() {<br />
		Forms = new System.Collections.ArrayList();<br />
		EnumWindows(new WndEnumProc(EnumCallback), 0);<br />
	}<br />
<br />
	private bool EnumCallback(System.IntPtr hWnd, int lParam) {<br />
<br />
		Control hForm = System.Windows.Forms.Control.FromHandle(hWnd);<br />
		// hForm is null for handles not created by your app...<br />
		if (hForm != null) this.Forms.Add(hForm);<br />
		return true;<br />
	}<br />
<br />
	public static void SetVisiblity(bool fVisible) {<br />
<br />
		foreach (System.Windows.Forms.Form objForm in new GetFormsCollection().Forms) {<br />
			objForm.Visible = fVisible;<br />
		}<br />
	}<br />
}<br />

SJ_Phoenix wrote:

Does C# 3 gets delivered together with .net framework 3.0

-Yoyosh- wrote:

I read many MSDN articles

lsugirljte wrote:

Can you override inherited delegates? If so, how?

 The OnRowUpdating method also allows derived classes to handle the event without 
attaching a delegate. This is the preferred technique for handling the event in a derived class.

class GridView
{
   public event RowUpdatingDelegate RowUpdating;
}

class MyMultiGridView : GridView
{
  public new event RowUpdatingDelegate RowUpdating;
}

GridView g = new GridView();
g.RowUpdating += ... // Won't work

MyMultiGridView g = new MyMultiGridView();
g.RowUpdating += ... // This will work.