and in your code one example is something like this.
Dim Box As New TextBox
Box.Text = "0"
AddHandler Box.TextChanged, AddressOf TextBox_Change
Pls1.Controls.Add(Box)
Another example is a literal control like the following.
Pls1.Controls.Add(New LiteralControl(stringControl))
where stringControl in a string variable with the literal text that will be
output to the browser like "<h1>My Heading</h1>"
Hope this helps.
You should also note that conrols added to the page have to be re-added on
postback in most cases.