adding eventhandler programatically

[hmkaddoura]

Hi all,

I have a question...

I'm creating tabs programmatically using vb.net . in each tab that is created there is listbox, and 4buttons (also added by coding).

when i change the listbox selected item, an event should be called, lets say a messagebox will appear with the selected index of that tab.

I want to know how can I make this handler work for all the listbox that I create in different tabs?

What do you think? any advice?

Regards,
HK

[dzenanz]

1. make handler as target for SelectedIndexChanged event of all listboxes.
2. in handler, cast sender to listbox, and then use it's parent property (parent should be TabControl), which has TabIndex property, c#:
((TabControl)(((ListBox)sender).Parent)).TabIndex

HTH, Dženan

[hmkaddoura]

1. make handler as target for SelectedIndexChanged event of all listboxes.
2. in handler, cast sender to listbox, and then use it's parent property (parent should be TabControl), which has TabIndex property, c#:
((TabControl)(((ListBox)sender).Parent)).TabIndex

HTH, Dženan

how can I make 1? (do u have code)

[dzenanz]

doubleclicking on one of the listboxes will make a handler named something like listBox1_SelectedIndexChanged. click on second listbox, open it's property page, go to it's events, find SelectedIndexChanged, and in dropdown list next to it choose listBox1_SelectedIndexChanged. Repeat procedure for as many listboxes as you like.
If you want to programatically add event handlers, use syntax (copied from form1.desinger.cs):

listBox2.SelectedIndexChanged += new System.EventHandler(this.listBox1_SelectedIndexChanged);

Finally, you should have handler that looks like this:

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    this.Text /*form title*/= ((TabControl)(((TabPage)(((ListBox)sender).Parent)).Parent)).SelectedIndex.ToString();
}

and sets forms's title to 0, 1, 2, ... depending on tab's index in which listbox was nested.
note:
sender=listbox
sender.parent=tabpage
sender.parent.parent=tabcontrol
tabcontrol has property selectedindex, and that is what you need

ps. This is C# synthax.

[hmkaddoura]

Thanks for the reply..

the first one didn't work for me. but your hint helped me to make it working after doing some search where i found the solution. it is:

AddHandler ListBox1new.SelectedIndexChanged, AddressOf ListBox1_SelectedIndexChanged
 

and there is no need to remove the

Handles ListBox1.SelectedIndexChanged

from

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

because when I removed it, the original ListBox1 didn't work ;)

and this worked very nice :)

Many thanks

[dzenanz]

I knew this is more the question of syntax, and less of algorithm, but C# code helps more than no code at all :D