ASP.NET数据绑定_第四篇_用SqlDataSource控件绑定_02

+++ 页面代码如下：
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True" PageSize="3"
    AutoGenerateColumns="true" DataKeyNames="username" DataSourceID="SqlDataSource1"
    AutoGenerateDeleteButton="True"
    AutoGenerateEditButton="True"
    AutoGenerateSelectButton="True">       
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
    ConnectionString="Data Source=ora9;User ID=scott;Password=tiger;Persist Security Info=True"
    ProviderName="System.Data.OracleClient"
    SelectCommand="SELECT USERNAME, USERPWD from USERS"
    UpdateCommand="UPDATE USERS SET USERPWD =:userpwd where USERNAME = :username"
    DeleteCommand="DELETE from USERS where USERNAME =:username">
    <UpdateParameters>
        <asp:ControlParameter ControlID="GridView1" DefaultValue="username" Name="username"
            PropertyName="SelectedValue" />
        <asp:ControlParameter ControlID="GridView1" DefaultValue="userpwd" Name="userpwd"
            PropertyName="SelectedValue" />
    </UpdateParameters>
    <DeleteParameters>
        <asp:ControlParameter ControlID="GridView1" DefaultValue="" Name="username" PropertyName="SelectedValue" />
    </DeleteParameters>
</asp:SqlDataSource>
+++ 后台代码如下：
(略)
+++ 说明：
(1) 数据集绑定到控件有多种方式；
(2) 一是用像SqlDataSource控件、AccessDataSource控件进行绑定；
(3) 二是用更抽象的控件，如ObjectDataSource控件绑定；
(4) 三是用DataTable或DataSet绑定；
(5) 这