HOW TO: dynamically add control in VB.NET?

Dear all,

I have this question. Is it possible for VB.NET to add or dynamically create control during run-time? And, how would I add event handler for these dynamically created controls.
Please advice me on this. Any help you may have will be very much appreciated. Thanks in advance.


Best Regards,

Owen/

Dear Owen,

I think there is nothing impossible in this world and same apply when we programming in any language.

Here below is the solution for your problem:

1. Add any procedure for event handling of the control like as follows:


Protected Sub button1_Click(sender As Object, e As System.EventArgs)
' Go to the previous item in the Customer list.
messagebox.show("Button Pressed")
End Sub



2. Add following line immediately after the following lines

Public Class Form1
Inherits Form

in the form:


Private button1 As Button



2. Add following line of code in InitializeComponent method of the form (you can find InitializeComponent method when you expand #Region " Windows Form Designer generated code "


With Me
.components = New Container
.button1 = New Button

With .button1
.Location = New Point(24, 16)
.Size = New Size(64, 24)
.Text = "<"
AddHandler button1.click, AddressOf button1_Click
End With

With .Controls
.Add(button1)
End With
End With


Hope this will solve your problem.

Regards

Gurdarshan Singh

Yeah, ITGURU's solution is pretty much how you would want to do it. You can set up functions which will create the widget of your choice and add those to a form, panel, or other container. Then, you can dynamically run those functions at run-time (all you really have to pass is a location and a size). The best place to start would probably be by looking at the ControlCollections, and, in particular, the Add method for these ControlCollections.

Adding the event handler is a little trickier, but I would assume that you should be able to do that in your widget-creation functions as well.

Thanks ITGURU, it really works. That was very CLEVER.

Then, I implement this array of push button.
But I have problem determining which of those buttons is being pushed, since there were no index variable exposed inside button1_Click() sub module. Any advice?

Again, thank you very much.


Regards,

Owen/

You could try using the Control Collection index for the button. For example, if it's the button is the first form element on the form, you could say:

AddHandler Me.Controls(0).Click(), AddressOf button1_Click

This index starts at 0 and increases sequentially with each new element you put on the form.

hello,

Please try using Text property of the Button control for finiding which control is clicked and you can find the detail by using following code:

Write following line for validating the control to whom user clicked in the Event which is assigned to the control:

if CType(sender, Button).Text) = "Button1" then
else
if CType(sender, Button).Text) = "Button3" then
endif
endif


Hope this will solve your problem.

That's a good suggestion, ITGURU. Thanks.
Thank you Rube74.
Have a nice day to both of you.


Best Regards,

Owen/