ASP.NET服务器端控件RadioButtonList，DropDownList，CheckBoxList的取值、赋值用法

<asp:RadioButtonList ID="RadioButtonList1" RepeatDirection="Horizontal" RepeatLayout="Flow"
            runat="server">
            <asp:ListItem Value="0">单选一</asp:ListItem>
            <asp:ListItem Value="1">单选二</asp:ListItem>
            <asp:ListItem Value="2">单选三</asp:ListItem>
        </asp:RadioButtonList>
        <br />
        <asp:CheckBoxList ID="CheckBoxList1" RepeatDirection="Horizontal" RepeatLayout="Flow"
            runat="server">
            <asp:ListItem Value="0">多选一</asp:ListItem>
            <asp:ListItem Value="1">多选二</asp:ListItem>
            <asp:ListItem Value="2">多选三</asp:ListItem>
        </asp:CheckBoxList>
        <br />
        <asp:DropDownList ID="DropDownList1" RepeatDirection="Horizontal" RepeatLayout="Flow"
            runat="server">
            <asp:ListItem Value="0">下拉选择一</asp:ListItem>
            <asp:ListItem Value="1">下拉选择二</asp:ListItem>
            <asp:ListItem Value="2">下拉选择三</asp:ListItem>
        </asp:DropDownList>

<span id="RadioButtonList1">
      <input id="RadioButtonList1_0" type="radio" name="RadioButtonList1" value="0" /><label for="RadioButtonList1_0">单选一</label>
      <input id="RadioButtonList1_1" type="radio" name="RadioButtonList1" value="1" /><label for="RadioButtonList1_1">单选二</label>
      <input id="RadioButtonList1_2" type="radio" name="RadioButtonList1" value="2" /><label for="RadioButtonList1_2">单选三</label>
   </span>
        <br />
   <span id="CheckBoxList1">
      <input id="CheckBoxList1_0" type="checkbox" name="CheckBoxList1$0" value="0" /><label for="CheckBoxList1_0">多选一</label>
      <input id="CheckBoxList1_1" type="checkbox" name="CheckBoxList1$1" value="1" /><label for="CheckBoxList1_1">多选二</label>
      <input id="CheckBoxList1_2" type="checkbox" name="CheckBoxList1$2" value="2" /><label for="CheckBoxList1_2">多选三</label>
   </span>
        <br />
   <select name="DropDownList1" id="DropDownList1" RepeatDirection="Horizontal" RepeatLayout="Flow">
    <option value="0">下拉选择一</option>
    <option value="1">下拉选择二</option>
    <option value="2">下拉选择三</option>
   </select>

 $("#RadioButtonList1").change(function () {
   //弹出选中项的val值
                alert($("input[name='RadioButtonList1']:checked").val());
  //弹出选中项的text值
                alert($("input[name='RadioButtonList1']:checked+label").text())
  }); 

//默认选中第二项
var rbts = document.getElementsByName("RadioButtonList1");
            for (var i = 0; i < rbts.length; i++) {
                if (rbts[i].value == "1")
                    rbts[i].checked = "true";
            }

 $("#DropDownList1").change(function () {
//弹出选中项的Val值
                alert($("#DropDownList1").val());
//弹出选中项的text值
                alert($("#DropDownList1 option:selected").text());
            });

//默认选中第二项
var ddls = $("#DropDownList1 option");
                        for (var i = 0; i < ddl.length; i++) {
                            if (ddl[i].value == "1") {
                                ddl[i].selected = "true";
                            }
                        }

$("#CheckBoxList1 > input").click(function () {
               var arrval = [];
                var val = "";
              $("#CheckBoxList1 :checkbox:checked").each(function () {
             //将选中项的值放进数组arrval
                    arrval.push($(this).val())
                })
            //将数组中的val值以‘,'进行连接
                val = arrval.join(',');
              //弹出所有选择的项以,连接
                                alert(val);
                var arrtext = [];
                var text = "";
                $("#CheckBoxList1 :checkbox:checked").each(function () {
              //将选中项的text值放进arrtext数组中
                    arrtext.push($(this).next().html());
              //将数组中的数据用,进行连接
                    text = arrtext.join(",");
                })
             //弹出选中项的Text值
               alert(text);
                });

   var cbks = $("#CheckBoxList1 input[type='checkbox']");
            for (var i = 0; i < cbks.length; i++) {
                if (cbks[i].value== "1"||cbks[i].value=="2") {
                    cbks[i].checked = "true";
                }
            }