Visual Web Developer 2008 - ASP - Formview and Inserts - asp.net

Question

Im using:
Visual Web Developer 2009
Access 2007
I am trying to insert into a products table, however i keep recieveing the error:
"Data type mismatch in criteria expression."
The Edit and Delete sections work fine..
Edit Products
<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False"
DataKeyNames="product_id" DataSourceID="AccessDataSource1" DefaultMode="Insert"
Height="50px" Width="125px">
<Fields>
<asp:BoundField DataField="product_id" HeaderText="product_id"
InsertVisible="False" ReadOnly="True" SortExpression="product_id" />
<asp:BoundField DataField="product_name" HeaderText="product_name"
SortExpression="product_name" />
<asp:BoundField DataField="product_desc" HeaderText="product_desc"
SortExpression="product_desc" />
<asp:BoundField DataField="product_cost" HeaderText="product_cost"
SortExpression="product_cost" />
<asp:BoundField DataField="product_amount" HeaderText="product_amount"
SortExpression="product_amount" />
<asp:BoundField DataField="category_id" HeaderText="category_id"
SortExpression="category_id" />
<asp:CommandField ShowInsertButton="True" />
</Fields>
</asp:DetailsView>
<asp:AccessDataSource ID="AccessDataSource1" runat="server"
DataFile="~/App_Data/Fandangles.mdb"
DeleteCommand="DELETE FROM [product] WHERE [product_id] = ?"
InsertCommand="INSERT INTO [product] ([product_name], [product_desc], [product_cost], [product_amount], [category_id]) VALUES (?, ?, ?, ?, ?)"
SelectCommand="SELECT * FROM [product]"
UpdateCommand="UPDATE [product] SET [product_name] = ?, [product_desc] = ?, [product_cost] = ?, [product_amount] = ?, [category_id] = ? WHERE [product_id] = ?">
<DeleteParameters>
<asp:Parameter Name="product_id" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp:Parameter Name="product_name" Type="String" />
<asp:Parameter Name="product_desc" Type="String" />
<asp:Parameter Name="product_cost" Type="Decimal" />
<asp:Parameter Name="product_amount" Type="Int32" />
<asp:Parameter Name="category_id" Type="Int32" />
<asp:Parameter Name="product_id" Type="Int32" />
</UpdateParameters>
<InsertParameters>
<asp:Parameter Name="product_id" Type="Int32" />
<asp:Parameter Name="product_name" Type="String" />
<asp:Parameter Name="product_desc" Type="String" />
<asp:Parameter Name="product_cost" Type="Decimal" />
<asp:Parameter Name="product_amount" Type="Int32" />
<asp:Parameter Name="category_id" Type="Int32" />
</InsertParameters>
</asp:AccessDataSource>
</p>
</asp:Content>
DB: Access DB
product_id - Autonumber
product_name - Text
product_desc - Text
product_cost - Currency
product_amount - Number
category_id - Number - This is a lookup field
Any ideas?

Answer 1

Do you really need to pass your primary key "product_id" into the insert? If its an identity / PK its not needed.
Its not a param in your insert SQL yet it is a param in the datasoruces insert params.
Try this
<InsertParameters>
<asp:Parameter Name="product_id" Type="Int32" />
<asp:Parameter Name="product_name" Type="String" />
<asp:Parameter Name="product_desc" Type="String" />
<asp:Parameter Name="product_cost" Type="Decimal" />
<asp:Parameter Name="product_amount" Type="Int32" />
<asp:Parameter Name="category_id" Type="Int32" />
</InsertParameters>