ASP.Net/Language Basics/Double

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Read TextBox input, convert to double and do calculation (C#)

<%@ Page Language="C#" Debug="true" %>
<script runat="server">
    void Page_Load()
    {
       if (Page.IsPostBack)
       {
         lblTax.Text = "Your tax bill would be $";
         lblTax.Text += Convert.ToString(Convert.ToInt32(txtEarnings.Text)*Convert.ToInt32(txtTaxRate.Text)/100);
         lblTax.Visible=true;
       }
    }
</script>
<html>
<head>
    <title>Calculate Tax Bill</title>
</head>
<body>
    <h3>Tax rates 
    </h3>
    <form runat="server">
        Please enter your earnings: $ 
        <asp:TextBox id="txtEarnings" runat="server" width="80px"></asp:TextBox>
        <br />
        Please enter your tax rate, for example enter "7" for 7% 
        <asp:TextBox id="txtTaxRate" runat="server" width="30px"></asp:TextBox>
        <br />
        <asp:Button id="Button1" runat="server" Text="Submit"></asp:Button>
        <br />
        <asp:Label id="lblTax" runat="server" visible="False"></asp:Label>
        <br />
    </form>
</body>
</html>



Use Double to calculate Tax (C#)

<script Language="c#" runat="server">
  void Page_Load()
  {
    double dblEarn = 150;
    double dblTax = 23;
    double dblTotal = dblEarn - ((dblEarn/100)*dblTax);
    Display1.Text = dblTotal.ToString();
  }
</script>
<html>
<head>
  <title>Declaring Variables</title>
</head>
<body>
  <asp:label id="Display1" runat="server" />
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.Net/Language_Basics/Double&oldid=2196»