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стиль ASP

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Default.aspx
<%@ Page Language="C#" %>
 
<!DOCTYPE html>
 
<%@ Import Namespace="Style_Of_ASP" %>
 
<script runat="server">
 
</script>
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
 <meta charset="utf-8" />
 <title>Расчет электроенергии</title>
 <link href="css/style.css" rel="stylesheet" />
</head>
<body>
 <form id="form1" runat="server">
 <%
  string showStart = null;
  string showEnd = null;
  string price = null;
  if(Request.HttpMethod == "POST") {
   //делаем view state
   if(Request["calculate"] != null) {
    showStart = Request["showStart"];
    showEnd = Request["showEnd"];
    price = Request["price"];
   }
   if(Request["clear"] != null) {
    showStart = null;
    showEnd = null;
    price = null;
   }
  }
 %>
  <div class="a">
   <input type="text" name="showStart" value="<% Response.Write(showStart); %>" />
   &nbsp;&nbsp;
   <label>Начальные показания</label>
   <br />
   <br />
   <input type="text" name="showEnd" value="<% Response.Write(showEnd); %>" />
   &nbsp;&nbsp;
   <label>Конечные показания</label>
   <br />
   <br />
   <input type="text" name="price" value="<% Response.Write(price); %>" />
   &nbsp;&nbsp;
   <label>Цена за 1кВт/ч</label>
   <br />
   <br />
   <input id="calculate" type="submit" name="calculate" value="Расчитать" />
   <br />
   <br />
   <input id="clear" type="submit" name="clear" value="Очистить" />
   <div id="b" class="b">
     <label id="result">
     <%
      if(Request.HttpMethod == "POST" && Request["calculate"] != null && Request["clear"] == null) {
       Counter C = new Counter(showStart, showEnd, price);
       Response.Write("Сумма = " + C.Sum().ToString());
      }
     %>
     </label>
   </div>
  </div>
 </form>
</body>
</html>
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css/style.css
* {
 margin: 0;
 padding: 0;
}
 
.a {
 height: 298px;
 width: 448px;
 position: absolute;
 top: 50%;
 left: 50%;
 margin-top: -175px;
 margin-left: -250px;
 padding: 25px;
 background-color: #D3E0ED;
 border: 1px solid #FFB300;
 border-radius: 20px;
}
 
input, label {
 font-size: 20px;
 text-align: center;
 width: 200px;
}
 
#calculate, #clear {
 cursor: pointer;
}
 
.b {
 height: 60px;
 width: 400px;
 margin: 25px 25px 25px 25px;
 line-height: 60px;
 text-align: center;
 font-size: 22px;
 border: 1px solid #FFB300;
 border-radius: 10px;
}
 
.b label {
 font-size: 24px;
}
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App_Code/Counter.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
 
namespace Style_Of_ASP {
 public class Counter {
  ushort showStart;
  ushort showEnd;
  decimal price;
  public Counter(string arg0, string arg1, string arg2) {
   ushort.TryParse(arg0, out showStart);
   ushort.TryParse(arg1, out showEnd);
   decimal.TryParse(arg2, out price);
  }
  public ushort ResultShow() {
   return (ushort)(showEnd - showStart);
  }
  public decimal Sum() {
   return Math.Round((decimal)ResultShow()*price, 2);
  }
 }
}