Chapter 14 - page 525-527 Validation Issue

papadan · March 29th, 2018, 06:48 PM

After following all the steps in Chapter 14 - pages 525-527, I was able to upload images to the Photo Album / Pictures tables. However, when I attempt to DELETE an entry (using the delete button previously created for the ManagePhotoAlbum page) - I get validation messages on the Insert fields triggered. Even though I did not press Insert, but rather Delete. Because of these validation items being triggered, the ListView1_DeleteItem(int id) method never fires and therefore I cannot delete any items.

When I set the 'Causes Validation' property in the Delete button section from 'true' to 'false', I was then able to delete. But shouldn't that be independent of the Insert Validation?

Please assist. I am using VS Community 2017 on Windows 10 with SQL Sever 2012.

Daniel

Imar · March 30th, 2018, 07:46 AM

Hi Daniel,

Looks like you missed the CausesValidation attribute on page 514:

Code:

<asp:Button ID="DeleteButton" runat="server" CommandName="Delete"
Text="Delete" CausesValidation="False" />

With that attribute set to False, the Delete but no longer triggers a call to the validation routines.

Hope this helps,

Imar

papadan · March 30th, 2018, 12:11 PM

Thanks, I see that I missed that now.

What if I want the Delete button to fire off some validation of it's own? I assume I would have to do it in the C# (or VB) event handler, correct? The ListView1_DeleteItem(int id) event, correct?

Or is there a way to fire off separate validation (without touching the Insert validation controls) for the Delete button, without going into the event handler?

Imar · April 1st, 2018, 07:39 AM

You can use ValidationGroup to separate one set of controls from another: https://msdn.microsoft.com/en-us/library/ms227424.aspx