I've found a way to initialize textboxes for my detailsview insert, but now I need to do the same for checkboxes (some need to start as true). The following is my code for textboxes:

Protected Sub DetailsView1_DataBinding(ByVal sender As Object, ByVal e As System.EventArgs) Handles DetailsView1.PreRender
If DetailsView1.CurrentMode = DetailsViewMode.Insert Then
 Dim ThisControl As TextBox
 ThisControl = DetailsView1.FindControl("InsertEventName")
 ThisControl.Text = "new event"
 ThisControl = DetailsView1.FindControl("InsertDays")
 ThisControl.Text = "1"
 End if
End Sub

Frankly, I don't completely understand it all because I'm a newbie and still struggling with developing my .net skills. I've tried the obvious to make it work for checkboxes too, but when I insert this:

 Dim ThisCheck As Checkbox
 ThisCheck = DetailsView1.FindControl("RegisterOnline")
 ThisCheck.Checked = True

I get an error message that says BC30456: 'Checked' is not a member of 'System.Web.UI.Control'.

What am I missing?

Why not just set it as checked in the control's "Properies" window?

Dim ThisControl As CheckBox
 ThisControl = DetailsView1.FindControl"Name of checkBox")
thiscontol.checked= true;

Insert this block before the "ENDIF"