asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ProductID"
    DataSourceID="SqlDataSource1">
    Columns>
        asp:BoundField DataField="ProductID" HeaderText="ProductID" InsertVisible="False"
            ReadOnly="True" SortExpression="ProductID" />
        asp:BoundField DataField="ProductName" HeaderText="ProductName" SortExpression="ProductName" />
        asp:BoundField DataField="SupplierID" HeaderText="SupplierID" SortExpression="SupplierID" />
        asp:BoundField DataField="CategoryID" HeaderText="CategoryID" SortExpression="CategoryID" />
        asp:TemplateField>
            ItemTemplate>
                asp:CheckBox ID="chk_Del" runat="server" />
            /ItemTemplate>
        /asp:TemplateField>
    /Columns>
/asp:GridView>

//接下來往頁面上添加一個checkbox控件

asp:CheckBox ID="chk_JS" runat="server" Text="全選(JS)" onclick="selectAll(this)"/>
//并為該控件編寫JS腳本如下：
script type="text/javascript">

    //根據傳入的checkbox的選中狀態設置所有checkbox的選中狀態
    function selectAll(obj)
    {
        var allInput = document.getElementsByTagName("input");
        //alert(allInput.length);
        var loopTime = allInput.length;
        for(i = 0;i loopTime;i++)
        {
            //alert(allInput[i].type);
            if(allInput[i].type == "checkbox")
            {
                allInput[i].checked = obj.checked;
            }
        }
    }
/script>
//基本效果就有了，接下來我們在點綴一下。在網頁中添加一個button
asp:Button ID="btn_DeleteRecords" runat="server" OnClientClick="return judgeSelect();" Text="刪除選中記錄" />
//添加JS腳本
//判斷是否選中記錄，用戶確認刪除
function judgeSelect()
{
    var result = false;
    var allInput = document.getElementsByTagName("input");
    var loopTime = allInput.length;
    for(i = 0;i loopTime;i++)
    {
        if(allInput[i].checked)
        {
            result = true;
            break;
        }
    }
    if(!result)
    {
        alert("請先選則要刪除的記錄！");
        return result;
    }
    result = confirm("你確認要刪除選定的記錄嗎？");
    return result;
}

int a = this.GridView1.Rows.Count;
for (int i = 0; i a; i++)
{
    CheckBox chk = (CheckBox)this.GridView1.Rows[i].FindControl("chk_Del");
    chk.Checked = this.chk_Server.Checked;
}