javascript - aspcontrol

Partial Class _Default
    Inherits System.Web.UI.Page

    Protected Sub btn_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btn.Click

    End Sub

    Protected Sub btn_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles btn.Load
        If Not Page.IsPostBack Then
            btn.Attributes.Add("onclick", "javascritpt:return sum();")
        End If
    End Sub
End Class