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'Must declare the scalar variable " Error with asp.net gridview

Posted on 2008-06-20
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Last Modified: 2010-04-21
I am trying to add the delete function to a grid view and am getting the 'Must declare the scalar variable "@SaleRef" error. I have looked at other forums and the common problem seems to be not delclaring the parameter and not having DataKeyNames set. I think I have done this (see code).

I've looked at this for so long I can't see where I've gone wrong...

Thanks for your help
<form id="form1" runat="server">
    <div>
<asp:SqlDataSource ID="SqlDataSource1" 
     Runat="server"
     ConnectionString="Server=mysqlserver; Database=mydb; User ID=myuserid; Password=mypass;"
					DeleteCommand="DELETE FROM [SaleRef] WHERE [SaleRef] = @SaleRef"
					SelectCommand="SELECT [SaleRef], [ClosingDate], [ClosingTime] FROM [SaleDetails]"
            providerName="System.Data.SqlClient">
			<DeleteParameters>
                <asp:Parameter Name="SaleRef" Type="Int32" />
            </DeleteParameters>
</asp:SqlDataSource>
 
    </div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" BackColor="#FFE0C0"
            BorderColor="black" BorderStyle="Solid" BorderWidth="5px" DataKeyNames="SaleRef"
            DataSourceID="SqlDataSource1" EmptyDataText="There are no sales" Font-Names="Verdana"
            Font-Size="Small" GridLines="None">
			<Columns>
                <asp:CommandField ShowDeleteButton="True" ButtonType="Button" DeleteText="Delete Sale" />
				<asp:BoundField DataField="SaleRef" HeaderText="Sale #" />
                <asp:BoundField DataField="closingdate" HeaderText="Closing Date" HtmlEncode="False" />
                <asp:BoundField DataField="closingtime" HeaderText="Closing Time" HtmlEncode="False" />
            </Columns>
            <HeaderStyle BackColor="Green" Font-Size="small" Font-Underline="True" ForeColor="White" />
            <AlternatingRowStyle BackColor="#E0E0E0" />
        </asp:GridView>
    </form>

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Question by:kirkheaton25
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Expert Comment

by:TimCottee
ID: 21829956
Hello kirkheaton25,

                  <asp:Parameter Name="SaleRef" Type="Int32" />
Should be
                  <asp:Parameter Name="@SaleRef" Type="Int32" />

Regards,

TimCottee
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Author Comment

by:kirkheaton25
ID: 21829999
Thanks, however after making that change I now get the message:
Invalid object name 'SaleRef'. Any ideas?
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LVL 21

Expert Comment

by:naspinski
ID: 21830010
Tim, I think he is ok with his declaration.

I think what you are missing is a way to declare your SaleRef, you never state which one to delete.

Usually this is in a SessionParameter, ControlParameter or QueryStringParameter.  Yours is simply a Parameter so the program does not know which one to delete.  You have to make sure you specify that.
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Author Comment

by:kirkheaton25
ID: 21830459
Hi Naspinski,
Isn't the SaleRef value being sent through the postback when I click the delete button?
(From the grid source code: __doPostBack('GridView1','Delete$2')".)
Is this a ControlParameter, it shouldn't be SessionParameter or QueryStringParameter should it?
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Accepted Solution

by:
naspinski earned 2000 total points
ID: 21830508
You are corerct, I didn't realize you were populating them automatically.  I think I see what the problem is.  Your DeleteCOmmand is: "DELETE FROM [SaleRef] WHERE [SaleRef] = @SaleRef"
But it looks like your DB is SaleDetails, so I think the SaleRef we are looking at is the first one, which is not correct at all.  It should be
DELETE FROM [SaleDetails] WHERE [SaleRef] = @SaleRef

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Author Closing Comment

by:kirkheaton25
ID: 31469108
Many Thanks for your help. I was too busy looking at the paramters and got caught out with a schoolboy sql mistake!
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