Galhano //127.0.0.1

<asp:button runat="server" ID="button1"  Text="popup"  ></asp:Button>

vb sample:

Protected Sub button1_Click(sender As Object, e As System.EventArgs) Handles button1.Click

Dim sb As New StringBuilder()
sb.Append("<script>")
sb.Append("window.open('http://www.galhano.com', '', '');")
sb.Append("</script>")

Dim cstype As Type = Me.GetType()

Page.ClientScript.RegisterStartupScript(cstype,"test", sb.ToString())

End Sub