C#

public class myClass
{
	public event EventHandler ControlVlaueChanged;
	public event DataGridViewCellEventHandler DataGridViewCellDataChanged;

	public FormEx()
        	{
            		this.ControlVlaueChanged += new EventHandler(this.OnControlValueChanged);
	}	
	
	private void myMethod(Control control)
	{
		if (control is DataGridView) (control as DataGridView).CellValueChanged += (DataGridViewCellEventHandler)this.ControlVlaueChanged;	
	}

	protected virtual void OnControlValueChanged(object sender, EventArgs e)
       	{
            		// some general works
        	}
}

protected override void OnPaint(PaintEventArgs e)
{
    Graphics g = e.Graphics;

    using(Region boardRegion = new Region(new Rectangle(ClientRectangle.X, ClientRectangle.Y,
        (int)(ClientRectangle.Width), (int)(ClientRectangle.Height * boardRegionSize))))
    {
        g.Clip = boardRegion;
        using(Bitmap boardImage = new Bitmap(board.ImagePath)){
            g.DrawImage(boardImage, board.X, board.Y);
        }
    }
    base.OnPaint(e);
}

private void CMGame_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Up)
        board.Y -= 30;
}

this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.CMGame_KeyDown);

public interface Interface1
    {
        void myMethod();
    }

public class Class1 : Interface1
    {

        #region Interface1 Members

        private void myMethod()
        {
            throw new Exception("The method or operation is not implemented.");
        }

        #endregion
    }

oNode = treeview1.Nodes.Add(sCaption);
oNode.Tag = sTagValue;
oNode.ImageKey = sImageKey;
oNode.Expand();