This thread is for discussions of Object-Oriented ASP.NET.

Great article, but am I missing something. I go into Class view, but I get no "Add" option when I right-click on the project. This is an ASP.Net (VB.Net) project, so is it the case that this is not available in ASP.Net projects?

I'm using VB.NET 2003 and I don't see the "Add" option when I right click in the Class view either.

great article. I was able to implement the grid in VB.NET quite easily, and I plan on extending it in similar fashion to create DataGrids with selectable rows. Thanks Greg!

You have to add the class manually as a generic class, then use the Inherits statement

Public Class DeleteDataGrid ' or whatever you want to call it
   Inherits System.Web.UI.WebControls.DataGrid

Hitting ENTER after the Inherits statement will make the stubs appear automagically for both CreateControlHierarchy and PrepareControlHierarchy. OnItemDataBound, however, does not show up; you will have to add the function signature yourself.

HTH

Hi Elliot,
Is there any chance that you can show me the code for the derived datagrid in VB.net.
Im having trouble creating it myself. Im new to this subclassing stuff.
Thank you

Mick Lennon
Louth
Ireland

Mick:

shoot me an email at elliotmrodriguezathotmaildotcom and I will send you the class file. Perhaps we can work together on this.

Oddly enough, when I compile (without errors) and set a reference to the file in my web page, the grid never gets displayed. I've stepped through the code on the webpage that sets its properties, and they work fine; Intellisense shows my properties for the class, so I know its being seen, but none of the events in the class itself get called. I am perplexed.

Greg Ennis, can you also help?

I am getting as error message of

    C:\Program Files\ASP.NET Starter Kits\ASP.NET Portal (CSSDK)\PortalCSSDK\RegDataGrid.cs(20): The type or namespace name 'DataSource' could not be found (are you missing a using directive or an assembly reference?)

    and

    C:\Program Files\ASP.NET Starter Kits\ASP.NET Portal (CSSDK)\PortalCSSDK\RegDataGrid.cs(54): The type or namespace name 'DataGridItemEventArgs' could not be found (are you missing a using directive or an assembly reference?)

when running the code. What am I missing?

Here is the code I am running.

using System;

namespace ASPNET.StarterKit.Portal
{
   /// <summary>
   ///
   /// </summary>
   public class RegDataGrid : System.Web.UI.WebControls.DataGrid
   {
       public RegDataGrid()
       {
           //
           // TODO: Add constructor logic here
           //
       }

       // Class member that stores the index of the "Delete" column of this grid
       protected int delcol = -1;

       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;
       }

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

       protected override void OnItemDataBound(DataGridItemEventArgs e)
       {
           // Create it first in the DataGrid
           base.OnItemDataBound (e);

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