.Net 2.0的配置文件中新增加了一个节点<connectionStrings>。这个节点是专门用于存储数据库联接字符串的。不尽包含了字符串而且还包含了使用何种Provider的信息。
例如：
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
<appSettings/>
<connectionStrings>
<add name="NorthwindConnectionString1" connectionString="Data Source=(local);Initial Catalog=Northwind;Persist Security Info=True;User ID=sa;Password=123"
providerName="System.Data.SqlClient" />
</connectionStrings>
<configuration />
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString1 %>"
DeleteCommand="DELETE FROM [Categories] WHERE [CategoryID] = @original_CategoryID"
InsertCommand="INSERT INTO [Categories] ([CategoryName], [Description]) VALUES (@CategoryName, @Description)"
ProviderName="<%$ ConnectionStrings:NorthwindConnectionString1.ProviderName %>"
SelectCommand="SELECT [CategoryID], [CategoryName], [Description], [Picture] FROM [Categories]"
UpdateCommand="UPDATE [Categories] SET [CategoryName] = @CategoryName, [Description] = @Description WHERE [CategoryID] = @original_CategoryID">
<InsertParameters>
<asp:Parameter Name="CategoryName" Type="String" />
<asp:Parameter Name="Description" Type="String" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="CategoryName" Type="String" />
<asp:Parameter Name="Description" Type="String" />
<asp:Parameter Name="original_CategoryID" Type="Int32" />
</UpdateParameters>
<DeleteParameters>
<asp:Parameter Name="original_CategoryID" Type="Int32" />
</DeleteParameters>
</asp:SqlDataSource>
http://hi.baidu.com/telwo/item/a949cbf944b18d1fe3e3bdf8