Why doesn't ASP.net GridView update MS ACCESS record?

Question

I have:

<asp:GridView ID="ClassesGridView" runat="server" AutoGenerateColumns="False" DataKeyNames="CourseNumber" DataSourceID="AccessClasses" 
                AutoGenerateEditButton="True" >
                <Columns>
                    <asp:BoundField DataField="CourseNumber" HeaderText="CourseNumber" ReadOnly="True" SortExpression="CourseNumber" />
                    <asp:BoundField DataField="Teacher1" HeaderText="Teacher1" SortExpression="Teacher1" />
                    <asp:BoundField DataField="T1PhoneNumber" HeaderText="T1PhoneNumber" SortExpression="T1PhoneNumber" />
                    <asp:BoundField DataField="T1Email" HeaderText="T1Email" SortExpression="T1Email" />
                    <asp:BoundField DataField="Teacher2" HeaderText="Teacher2" SortExpression="Teacher2" />
                    <asp:BoundField DataField="T2PhoneNumber" HeaderText="T2PhoneNumber" SortExpression="T2PhoneNumber" />
                    <asp:BoundField DataField="T2Email" HeaderText="T2Email" SortExpression="T2Email" />
                    <asp:BoundField DataField="OrderToVisit" HeaderText="OrderToVisit" SortExpression="OrderToVisit" />
                </Columns>
</asp:GridView>
<asp:AccessDataSource ID="AccessClasses" runat="server" DataFile="~/App_Data/SundaySchool.mdb" 
                SelectCommand="SELECT [CourseNumber], [Teacher1], [T1PhoneNumber], [T1Email], [Teacher2], [T2PhoneNumber], [T2Email], [OrderToVisit] FROM [Classes]"
                UpdateCommand="UPDATE Classes SET Teacher1 = @Teacher1 WHERE CourseNumber = @CourseNumber">
</asp:AccessDataSource>

For the life of me I can't figure out why this won't update. The 'Edit' record works, but after changing the record and hitting 'Update' nothing happens. Everything reverts back.

EDIT: Something weird is happening here. If I set a value in the 'Teacher2' column, that will then populate to the 'Teacher1' column. The CourseNumber column also isn't what it should be which is why WHERE CourseNumber = @CourseNumber is not working.

Answer 1

You have to change the UpdateCommand, notice ? instead of @ :

<asp:AccessDataSource ID="AccessClasses" runat="server" DataFile="~/App_Data/SundaySchool.mdb" 
                SelectCommand="SELECT [CourseNumber], [Teacher1], [T1PhoneNumber], [T1Email], [Teacher2], [T2PhoneNumber], [T2Email], [OrderToVisit] FROM [Classes]"
                UpdateCommand="UPDATE Classes SET Teacher1 = ? WHERE CourseNumber = @CourseNumber">
</asp:AccessDataSource>

Here's more info about AccessDataSource: MSDN .

Answer 2

I figured this out. The UpdateCommand MUST follow the SelectCommand exactly with exception to the Primary Key, CourseNumber. EVERYTHING in the select must be in the update in the correct. Once I did that, everything worked great!!