SelectedIndexChanged to be handled by button click

Question

SharePoint Webpart (not visial webpart) VB.net (2010) I have list box that the user choose an item the click the button. The button will take the selectemitem.text and and create the output. in VB (asp) page that I am converting from this was handled by:

Protected Sub LBaddgrp_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Click_btnadd

in the webpart the "Handles Click_btnadd" it gives error handles clause requires with events variable

So how Do I do this in a webpart? I can't seem to find a example online.

Answer 1

Your Method Signature looks all wrong.

Your Method is called LBaddgrp_SelectedIndexChanged while it Handles Click_btnadd

Now I'm no VB expert, but shouldn't it be more like :

Protected Sub ListBox1_SelectedIndexChanged(sender As Object, e As System.EventArgs) Handles ListBox1.SelectedIndexChanged

End Sub

It seems you are handling the incorrect Event there mate.

What I think you are trying to achieve is this :

Protected Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click
    value = ListBox1.SelectedValue
End Sub

Hope this helps.

Answer 2

Do you want the user to be able to select an item from a list, as well as click a button (that is, allow to the user to do either), and have the same thing happen?

If so, you will need to use two separate event handlers, exactly as Fox has written here, but you need to have these two event handlers call a separate method which does the logic you want to do.

Essentially, the 'event' of selecting an item, or clicking the button, will call the extra new method that does what you want to do, via each 'events' respective event handlers.