GridView 的编辑、更新方法

布局页

aspx 页面中 GridView 布局（共四列数据和一列操作链接，只有后两列数据可以编辑）：
            <Columns>
                <asp:BoundField HeaderText="商品编号" DataField="PID" ReadOnly="true" SortExpression="PID" />
                <asp:BoundField HeaderText="供应商编号" DataField="GID" ReadOnly="true" SortExpression="GID" />
                <asp:TemplateField HeaderText="商品名称" SortExpression="PName">
                    <ItemTemplate>
                        <%#Eval("PName")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox Width="80px" Font-Size="8pt" Font-Names="Tahoma" ID="PName" Text='<%#Eval("PName")%>' runat="server" />
                    </EditItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="价格" SortExpression="Price">
                    <ItemTemplate>
                        <%#Eval("Price")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox ID="Price" runat="server" Font-Names="Tahoma" Font-Size="8pt" Text='<%#Eval("Price")%>' Width="50px" />
                    </EditItemTemplate>
                </asp:TemplateField>
                <asp:CommandField ShowEditButton="true" HeaderText="操作" ShowDeleteButton="True"
                    ShowSelectButton="True" />
            </Columns>

 

后置代码页

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