set an event in a ListBox in runtime

I want to create a ListBox in runtime

dim objCoun as new listbox
objCoun.id = "lbxCountries"
objCoun.Rows = "1"
objCoun.DataTextField = "Country_Name"
objCoun.DataValueField = "Country_Id"

But when I try to set the event

objCoun.OnSelectedIndexChanged="tro"

This is the error message:

Compiler Error Message: BC30390: 'System.Web.UI.WebControls.ListControl.Protected Overridable Sub OnSelectedIndexChanged(e As System.EventArgs)' is not accessible in this context because it is 'Protected'.

Source Error:

Line 44: objCoun.DataTextField = "Country_Name"
Line 45: objCoun.DataValueField = "Country_Id"
Line 46: objCoun.OnSelectedIndexChanged = "tro"
Line 47: objCoun.DataSource=dbread
Line 48: objCoun.DataBind()

How can I set the event in runtime?

Thanks for your helpTry:

AddHandler objCoun.SelectedIndexChanged, AddressOf tro

...assuming tro is the name of your event handler with the appropriate signature:

 Private Sub tro(ByVal sender As System.Object, ByVal e As System.EventArgs)

"tro" is the subroutine name. That means when the objCoun changes its index then the action is sent to "tro"

Set controls to nothing when finished?

Hello,
I recently saw some example code that looked similar to the following...

...
Dim literalBr As New System.Web.UI.LiteralControl()
literalBr.Text = "<br>"
literalBr.ID = "anId"
Panel1.Controls.Add(literalBr)
literalBr = Nothing
...

Is there a reason why the literalBr control was set to nothing after adding it to the panel? Does it cause memory usage to go up if you dont set controls to nothing after creating them programmatically?The garbage collector will take care cleaning up literalBr in this case. Setting literalBr to nothing is a waste of time. SeeProgramming for Garbage Collection for more details.