Adding JavaScript Code in Code Behind

Adds Client-side Confirmation Button to a Button Control

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

If Not IsPostBack Then
Me.Button1.Attributes.Add("onclick", "return confirm('Are you sure?');")
End If
End Sub

Adds Pop Up Window to Button Control

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles Button1.Click

Dim popupScript As String = ""

ClientScript.RegisterStartupScript(GetType(String), "PopupScript", popupScript)

End Sub