Operator '*' is not defined for type 'DBNull' and type 'Decimal'.

 I am getting an error from the following line


  <asp:Label ID="Label1" runat="server" Text='<%# String.Format("{0:C}", Eval("ProductQty") * Eval("Price"))   %>' ></asp:Label>


I think I may need to convert/define the Variables but not quite sure how to do it.


Any help would be great.

3/25/2009 12:28:09 PM
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it's not a matter of converting...its the fact that the value from the DB is Null...

You'll have to wrap an IF check around it or change your query to return 0 instead of Null. If the field is a Qty you shouldn't be allowing Null anyway, change the field in the DB to not allow nulls and use 0 as a default.

3/25/2009 12:31:50 PM

 Thanks for the reply, I have implement as you have suggested.  I now get the following error:


The field 'Orders.ProductQty' cannot contain a Null value because the Required property for this field is set to True.  Enter a value in this field.

 The new figure entered does not seem to get passed over.  Here is my select and update script

 <asp:AccessDataSource ID="AccessDataSource1" runat="server"
               DeleteCommand="DELETE FROM Orders WHERE (SessionID = ?) AND (ProductID = ?)"
            SelectCommand="SELECT Orders.SessionID, Orders.OrderID, Orders.CustomerID, Orders.ProductID, Orders.ProductQty, Orders.ItemTotal, Orders.[Date], Orders.Status, Products.ProductName, Products.Price FROM (Orders INNER JOIN Products ON Orders.ProductID = Products.ProductID) WHERE (Orders.SessionID = ?)"
              UpdateCommand="UPDATE Orders SET ProductQty = ? WHERE (ProductID = ?)">
                <asp:SessionParameter Name="SessionID" SessionField="SessionID" Type="String" />
                <asp:SessionParameter Name="SessionDate" SessionField="SessionDate" />
                <asp:Parameter Name="ProductID" Type="Int32" />


Can you see anything obvious that I have done wrong?  




3/25/2009 1:22:07 PM

Hmmm... change:
<asp:Parameter Name="ProductID" Type="Int32" />
<asp:Parameter Name="ProductID" Type="Int32" DefaultValue="0" />

3/25/2009 2:26:01 PM

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