Object-Oriented ASP.NET

using System;
using System.Collections;
using System.Web;
using System.Web.UI.WebControls;

namespace ooaspnet
{
	/// <summary>
	/// 
	/// </summary>
	public class ConfirmDelDataGrid : System.Web.UI.WebControls.DataGrid
	{
		// Index of the "Delete" command column for this grid
		protected int delcol = -1;
		protected bool confirmdel = true;

		// Property to enable/disable deletion confirmation
		public bool ConfirmOnDelete 
		{ 
			get { return confirmdel; } 
			set { confirmdel = value; } 
		}

		public ConfirmDelDataGrid()
		{
		}

		protected override ArrayList CreateColumnSet(PagedDataSource dataSource, bool useDataSource)
		{
			// Let the DataGrid create the columns
			ArrayList list = base.CreateColumnSet (dataSource, useDataSource);

			// Examine the columns
			delcol=0;
			foreach (DataGridColumn col in list)
			{
				// If this column is the "Delete" button command column...
				if ((col is ButtonColumn) && (((ButtonColumn)col).CommandName == "Delete"))
				{
					// Found it
					break;
				}
				delcol++;
			}

			// If we did not find a delete column, invalidate the index
			if (delcol == list.Count) delcol = -1;

			// Done
			return list;
		}

		protected override void OnItemDataBound(DataGridItemEventArgs e)
		{
			// Bind it first
			base.OnItemDataBound (e);

			// Confirm delete enabled?
			if (!confirmdel) return;

			// Attach javascript confirmation to the delete button
			if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.SelectedItem)
			{
				if (delcol != -1)
				{
					e.Item.Cells[delcol].Attributes.Add("onclick", "return confirm('Are you sure?')");
				}
			}
		}
	}
}