单项选择题

You create a Microsoft ASP.NET application by using the……

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. The application contains a DataSourceControl named CategoriesDataSource that is bound to a Microsoft SQL Server 2005 table. The CategoryName column is the primary key of the table. You write the following code fragment in a FormView control：
01 <tr>
02 <td align="right"><b>Category：</b></td>
03 <td><asp：DropDownList ID="InsertCategoryDropDownList"
04 ►
05 DataSourceID="CategoriesDataSource"
06 DataTextField="CategoryName"
07 DataValueField="CategoryID"
08 RunAt="Server" />
09 </td>
10 </tr>
You need to ensure that the changes made to the CategoryID field can be written to the database.
Which code fragment should you insert at line 04？（）

A.SelectedValue='<%# Eval("CategoryID") %>'
B.SelectedValue='<%# Bind("CategoryID") %>'
C.SelectedValue='<%# Eval("CategoryName") %>'
D.SelectedValue='<%# Bind("CategoryName") %>'

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