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<%@ Page Language="c#" %>
<%@ Import Namespace="ASPNetByExample" %>
<script runat="server">
void Page_Load(){
    if(!IsPostBack){
        price.Text = "0.00";
        tax.Text = "0.00";
    }
    else{
        tax.Text = SalesTax.computeTax(Double.Parse(price.Text)).ToString();
    }
    total.Text = (Double.Parse(price.Text) + Double.Parse(tax.Text)).ToString();
}
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<html>
    <body>
        <form id="YesNo" method="post" runat="server">
            <h1>
                Compute Sales Tax
            </h1>
            Price:
            <asp:TextBox Runat="server" ID="price" />
            <br />
            Tax:
            <asp:Label Runat="server" ID="tax" />
            <br />
            Total:
            <asp:Label Runat="server" ID="total" />
            <br />
            <asp:Button Runat="server" Text="Compute" />
        </form>
    </body>
</html>