Must declare scalar variable

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im having this problem, whenever i try to delete something from my gridview, this error shows, inserting and modifying does not have any errors.

XML

<table style="width:100%;">
             <tr>
                    <td class="style24" colspan="2">
                        <asp:SqlDataSource ID="SqlDataSource1" runat="server"
                            ConnectionString="<%$ ConnectionStrings:ConnectionString2 %>"
                            DeleteCommand="DELETE FROM [product] WHERE [productid] = @productid"
                            InsertCommand="INSERT INTO [product]([productid], [productname], [productdesc], [productprice]) VALUES (@productid, @productname, @productdesc, @productprice)"
                            SelectCommand="SELECT * FROM [product]"
                            UpdateCommand="UPDATE [product] SET [productid] = @productid, [productname] = @productname, [productdesc] = @productdesc, [productprice] = @productprice WHERE [productid] = @productid">
                            <DeleteParameters>
                                <asp:Parameter Name="productid" />
                            </DeleteParameters>
                            <UpdateParameters>
                                <asp:Parameter Name="productid" />
                                <asp:Parameter Name="productname" />
                                <asp:Parameter Name="productdesc" />
                                <asp:Parameter Name="productprice" />
                            </UpdateParameters>
                            <InsertParameters>
                                <asp:Parameter Name="productid" />
                                <asp:Parameter Name="productname" />
                                <asp:Parameter Name="productdesc" />
                                <asp:Parameter Name="productprice" />
                            </InsertParameters>
                        </asp:SqlDataSource>
                        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" onDeleteCommand="GridView1_onDeleteCommand"
                            DataSourceID="SqlDataSource1">
                            <Columns>
                                <asp:BoundField DataField="productid" HeaderText="productid" InsertVisible="False" ReadOnly="True"
                                    SortExpression="productid" />
                                    <asp:ImageField DataImageUrlField="productid" DataImageUrlFormatString="~/images/product/{0}.jpg">
                    </asp:ImageField>
                                <asp:BoundField DataField="productname" HeaderText="productname"
                                    SortExpression="productname" />
                                <asp:BoundField DataField="productdesc" HeaderText="productdesc"
                                    SortExpression="productdesc" />
                                <asp:BoundField DataField="productprice" HeaderText="productprice"
                                    SortExpression="productprice" />
                                <asp:CommandField ShowEditButton="True" />
                                <asp:CommandField DeleteImageUrl="~/images/product/{0}.jpg"
                                    ShowDeleteButton="True" />
                                    </Columns>
                        </asp:GridView>
                        <asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" DataSourceID="SqlDataSource1"
                Height="51px" Width="348px" DefaultMode="Insert">
                <Fields>
                    <asp:TemplateField HeaderText="Image">
                        <InsertItemTemplate>
                            <asp:FileUpload ID="FileUpload2" runat="server" Width="196px" />&nbsp;
                        </InsertItemTemplate>
                    </asp:TemplateField>
                    <asp:BoundField DataField="productid" HeaderText="productid"
                        SortExpression="productid" />
                    <asp:BoundField DataField="productname" HeaderText="productname"
                        SortExpression="productname" />
                    <asp:BoundField DataField="productdesc" HeaderText="productdesc"
                        SortExpression="productdesc" />
                    <asp:BoundField DataField="productprice" HeaderText="productprice"
                        SortExpression="productprice" />
                    <asp:CommandField NewText="Insert" ShowInsertButton="True" ShowCancelButton="False" CancelText="" />
                </Fields>
            </asp:DetailsView>
                    </td>
                </tr>
            </table>

thks in advance

Posted 6-Apr-10 12:56pm

hiyakaru

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hiyakaru · Answer 1 · 2010-04-06T13:12:00

problem solved, add in to the gridview, where

The code is underlined

<asp:removed id="GridView1" runat="server" autogeneratecolumns="False" xmlns:asp="#unknown">DataKeyNames="productid" onDeleteCommand="GridView1_onDeleteCommand"
                            DataSourceID="SqlDataSource1"></asp:removed>

The delete command gives this error because it could not find the variable '@productid' that it could pass to its DELETE query.

So , when the command DataKeyNames="productid" is inserted, it will allow the delete command to work.