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CheckBox

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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>
  h3 {
   text-align: center;
  }
 </style>
</head>
<body>
 <form id="form1" runat="server">
  <div>
   <h3>Вычисление суммы отмеченных цифр</h3>
   <asp:CheckBox ID="CheckBox1" runat="server" Text="1" TextAlign="Right" />
   <br />
   <asp:CheckBox ID="CheckBox2" runat="server" Text="2" TextAlign="Right" />
   <br />
   <asp:CheckBox ID="CheckBox3" runat="server" Text="3" TextAlign="Right" />
   <br />
   <asp:CheckBox ID="CheckBox4" runat="server" Text="4" TextAlign="Right" />
   <br />
   <asp:CheckBox ID="CheckBox5" runat="server" Text="5" TextAlign="Right" />
   <br />
   <br />
   <asp:Button ID="Button1" runat="server" Text="Вычислить" OnClick="Button1_Click" />
   &nbsp;&nbsp;
   <asp:Button ID="Button2" runat="server" Text="Очистить" OnClick="Button2_Click" />
   <br />
   <br />
   <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
  </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;
 
public partial class _Default : System.Web.UI.Page {
 protected void Page_Load(object sender, EventArgs e) {
 
 }
 protected void Button1_Click(object sender, EventArgs e) {
  int result = 0;
  if(CheckBox1.Checked) {
   result += int.Parse(CheckBox1.Text);
  }
  if(CheckBox2.Checked) {
   result += int.Parse(CheckBox2.Text);
  }
  if(CheckBox3.Checked) {
   result += int.Parse(CheckBox3.Text);
  }
  if(CheckBox4.Checked) {
   result += int.Parse(CheckBox4.Text);
  }
  if(CheckBox5.Checked) {
   result += int.Parse(CheckBox5.Text);
  }
  Label1.Text = result.ToString();
 }
 protected void Button2_Click(object sender, EventArgs e) {
  Label1.Text = string.Empty;
  CheckBox1.Checked = false;
  CheckBox2.Checked = false;
  CheckBox3.Checked = false;
  CheckBox4.Checked = false;
  CheckBox5.Checked = false;
 }
}