id 값이 “__board “ 테이블안에 checkbox를 찾아서 체크/체크아웃을 하는 예제입니다.
<%@ page language="C#" autoeventwireup="true" codefile="RadioSelect.aspx.cs" inherits="RadioSelect" %>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
    <script language="javascript">
        function CheckBoxSelect(result) {
             $("#__board").find("input[type=checkbox]").attr("checked", result);
        } 
    </script>
</head>
<body>
    <form runat="server">
    <input type="checkbox" id="selectall" onclick="CheckBoxSelect(this.checked);" name="selectall" />

        <table id="__board">
            <asp:repeater id="Repeater1" runat="server">         
            <ItemTemplate>             
            <tr> 
                <td>             
                   <input type="checkbox"  name="PostID" id="PostID"  value="<%# Eval("CategoryID") %>" / >  
                </td>  
                </tr> 
            </ItemTemplate> 
            </asp:repeater>
        </table>
    </form>
</body>
</html>
체크박스의 선택된 갯수 알아오기
var cnd = $("#__board").find("input:checkbox:checked").length;

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