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  Default.aspx  
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
 
<!DOCTYPE html>
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
 <meta charset="utf-8" />
 <title></title>
 <style>
  #Panel1 {
   height: auto;
   width: 600px;
   position: absolute;
   top: 50%;
   left: 50%;
   margin-top: -200px;
   margin-left: -300px;
   font-size: 22px;
   background-color: #E9F0F0;
  }
  #Button1, #Button2 {
   font-size: 22px;
   cursor: pointer;
  }
  .a {
   display: none;
  }
  .b {
   display: block;
   text-align: center;
   color: #F00;
  }
  #TextBox1, #TextBox2, #TextBox3 {
   font-size: 22px;
   text-align: center;
  }
 </style>
</head>
<body>
 <form id="form1" runat="server">
  <div>
   <asp:Panel ID="Panel1" runat="server" GroupingText="Расчет электроэнергии" ScrollBars="Auto">
    <br />
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    &nbsp;&nbsp;
    <asp:Label ID="Label1" runat="server" Text="начальные показания"></asp:Label>
    <br />
    <br />
    <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
    &nbsp;&nbsp;
    <asp:Label ID="Label2" runat="server" Text="конечные показания"></asp:Label>
    <br />
    <br />
    <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
    &nbsp;&nbsp;
    <asp:Label ID="Label3" runat="server" Text="цена за 1 кВт/час"></asp:Label>
    <br />
    <br />
    <asp:Button ID="Button1" runat="server" Text="Расчитать" OnClick="Button1_Click" />
    <br />
    <br />
    <asp:Button ID="Button2" runat="server" Text="Очистить" OnClick="Button2_Click"/>
    <br />
    <br />
    <asp:Label ID="Label4" runat="server" Text="Label" CssClass="a"></asp:Label>
   </asp:Panel>
  </div>
 </form>
</body>
</html>
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  Default.aspx.cs  
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
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);
 }
}
 
public partial class _Default : System.Web.UI.Page {
 protected void Page_Load(object sender, EventArgs e) {
 
 }
 protected void Button1_Click(object sender, EventArgs e) {
  Label4.CssClass = "b";
  Counter C = new Counter(TextBox1.Text, TextBox2.Text, TextBox3.Text);
  Label4.Text = "Сумма = " + C.Sum().ToString();
 }
 protected void Button2_Click(object sender, EventArgs e) {
  TextBox1.Text = string.Empty;
  TextBox2.Text = string.Empty;
  TextBox3.Text = string.Empty;
  Label4.Text = string.Empty;
  Label4.CssClass = "a";
 }
}

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