稍花些时间将ConflictDetection属性设置为CompareAllValues。配置GridView的属性和字段当正确的配置完ObjectDataSource的属性后，让我们把注意力放在GridView的设置上。首先，因为我们希望GridView支持编辑和删除，因此，从GridView的智能标记中点击添加新列，从下拉列表中选择CommandField并勾选上“删除”和“编辑/更新”。这将增加一个CommandField，它的ShowEditButton和ShowDeleteButton属性都已设置为true。当绑定ProductsOptimisticConcurrencyDataSource ObjectDataSource，该GridView对应每一个产品数据字段都包含一列。
虽然这样的一个GridView可以被编辑，但用户的体验将是不可接受的。这没有对数字栏作格式化处理，也没有validation控件以确保提供product's name并且unit price、units in stock、units on order、和reorder level的值都是大于零的数字。
跟我们在之前的给编辑和新增界面增加验证控件 这一节里所论述的一样，用户界面可以通过将绑定列（BoundFields）替换为模板列（TemplateFields）实现自定义。我已经通过以下方式修改了这个GridView和它的编辑界面：
1.删除ProductID、SupplierName、和CategoryName这几个绑定列；
2.将ProductName绑定列替换为模板列并添加一个RequiredFieldValidation控件；
3.将CategoryID和SupplierID绑定列替换为模板列，并调整编辑界面，使用DropDownList而不是TextBox。在这些模板列的ItemTemplates里，显示CategoryName和SupplierName字段；
4.将UnitPrice、UnitsInStock、UnitsOnOrder、和ReorderLevel绑定列替换为模板列并添加CompareValidator控件。因为我们在之前的章节里已经详细说明了如何完成这些任务，我仅仅把最终的声明语法列出并把具体执行留给读者作为练习。
<asp:GridView runat="server" AutoGenerateColumns="False" DataKeyNames="ProductID" DataSourceID="ProductsOptimisticConcurrencyDataSource" OnRowUpdated="ProductsGrid_RowUpdated"> <Columns> <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" /> <asp:TemplateField HeaderText="Product" SortExpression="ProductName"> <EditItemTemplate> <asp:TextBox runat="server" Text='<%# Bind("ProductName") %>'></asp:TextBox> <asp:RequiredFieldValidator ControlToValidate="EditProductName" ErrorMessage="You must enter a product name." runat="server">*</asp:RequiredFieldValidator> </EditItemTemplate> <ItemTemplate> <asp:Label runat="server" Text='<%# Bind("ProductName") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Category" SortExpression="CategoryName"> <EditItemTemplate> <asp:DropDownList runat="server" DataSourceID="CategoriesDataSource" AppendDataBoundItems="true" DataTextField="CategoryName" DataValueField="CategoryID" SelectedValue='<%# Bind("CategoryID") %>'> <asp:ListItem Value=">(None)</asp:ListItem> </asp:DropDownList><asp:ObjectDataSource runat="server" OldValuesParameterFormatString="original_{0}" SelectMethod="GetCategories" TypeName="CategoriesBLL"> </asp:ObjectDataSource> </EditItemTemplate> <ItemTemplate> <asp:Label runat="server" Text='<%# Bind("CategoryName") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Supplier" SortExpression="SupplierName"> <EditItemTemplate> <asp:DropDownList runat="server" DataSourceID="SuppliersDataSource" AppendDataBoundItems="true" DataTextField="CompanyName" DataValueField="SupplierID" SelectedValue='<%# Bind("SupplierID") %>'> <asp:ListItem Value=">(None)</asp:ListItem> </asp:DropDownList><asp:ObjectDataSource runat="server" OldValuesParameterFormatString="original_{0}" SelectMethod="GetSuppliers" TypeName="SuppliersBLL"> </asp:ObjectDataSource> </EditItemTemplate> <ItemTemplate> <asp:Label runat="server" Text='<%# Bind("SupplierName") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:BoundField DataField="QuantityPerUnit" HeaderText="Qty/Unit" SortExpression="QuantityPerUnit" /> <asp:TemplateField HeaderText="Price" SortExpression="UnitPrice"> <EditItemTemplate> <asp:TextBox runat="server" Text='<%# Bind("UnitPrice", "{0:N2}") %>' Columns="8" /> <asp:CompareValidator runat="server" ControlToValidate="EditUnitPrice" ErrorMessage="Unit price must be a valid currency value without the currency symbol and must have a value greater than or equal to zero." Operator="GreaterThanEqual" Type="Currency" ValueToCompare="0">*</asp:CompareValidator> </EditItemTemplate> <ItemTemplate> <asp:Label runat="server" Text='<%# Bind("UnitPrice", "{0:C}") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Units In Stock" SortExpression="UnitsInStock"> <EditItemTemplate> <asp:TextBox runat="server" Text='<%# Bind("UnitsInStock") %>' Columns="6"></asp:TextBox> <asp:CompareValidator runat="server" ControlToValidate="EditUnitsInStock" ErrorMessage="Units in stock must be a valid number greater than or equal to zero." Operator="GreaterThanEqual" Type="Integer" ValueToCompare="0">*</asp:CompareValidator> </EditItemTemplate> <ItemTemplate> <asp:Label runat="server" Text='<%# Bind("UnitsInStock", "{0:N0}") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Units On Order" SortExpression="UnitsOnOrder"> <EditItemTemplate> <asp:TextBox runat="server" Text='<%# Bind("UnitsOnOrder") %>' Columns="6"></asp:TextBox> <asp:CompareValidator runat="server" ControlToValidate="EditUnitsOnOrder" ErrorMessage="Units on order must be a valid numeric value greater than or equal to zero." Operator="GreaterThanEqual" Type="Integer" ValueToCompare="0">*</asp:CompareValidator> </EditItemTemplate> <ItemTemplate> <asp:Label runat="server" Text='<%# Bind("UnitsOnOrder", "{0:N0}") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Reorder Level" SortExpression="ReorderLevel"> <EditItemTemplate> <asp:TextBox runat="server" Text='<%# Bind("ReorderLevel") %>' Columns="6"></asp:TextBox> <asp:CompareValidator runat="server" ControlToValidate="EditReorderLevel" ErrorMessage="Reorder level must be a valid numeric value greater than or equal to zero." Operator="GreaterThanEqual" Type="Integer" ValueToCompare="0">*</asp:CompareValidator> </EditItemTemplate> <ItemTemplate> <asp:Label runat="server" Text='<%# Bind("ReorderLevel", "{0:N0}") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:CheckBoxField DataField="Discontinued" HeaderText="Discontinued" SortExpression="Discontinued" /> </Columns> </asp:GridView>