Must declare the Variable in ASP.NET

Just a simple Application.  One GridView viewing a table information.  One DetailView viewing details when user clicks on a record on the GridView, and I am getting an error "Must Declare the variable @AffiliateID".  Please HELP!!!.

<table cellpadding=0 cellspacing=0 align="center" valign="middle" width="100%" height="93%">
    <tr>
        <td align="left" valign="top">
            <asp:GridView ID="UnapprovedAccountGrid" runat="server" AllowPaging="True" AutoGenerateColumns="False"
                CellPadding="4" DataKeyNames="AffiliateID" DataSourceID="UnApproved_DS" ForeColor="#333333"
                GridLines="None" Width="100%" AllowSorting="True"  >
                <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                <Columns>
                    <asp:CommandField ShowSelectButton="True" SelectText="Details"/>
                    <asp:BoundField DataField="AffiliateCode" HeaderText="Affiliate Code" ReadOnly="True"
                        SortExpression="AffiliateCode" />
                    <asp:BoundField DataField="FirstName" HeaderText="First Name" SortExpression="FirstName" />
                    <asp:BoundField DataField="LastName" HeaderText="Last Name" SortExpression="LastName" />
                    <asp:BoundField DataField="Username" HeaderText="Username" SortExpression="Username" />
                    <asp:BoundField DataField="EmailAddress" HeaderText="Email Address" SortExpression="EmailAddress" />
                    <asp:BoundField DataField="SignupDate" HeaderText="Signup Date" SortExpression="SignupDate" />
                    <asp:BoundField DataField="SignupIP" HeaderText="Signup IP" SortExpression="SignupIP" />
                    <asp:BoundField DataField="ADTitle" HeaderText="AD Title" SortExpression="ADTitle" />
                    <asp:BoundField DataField="Active" HeaderText="Active" SortExpression="Active" />
                </Columns>
                <RowStyle BackColor="#EFF3FB" />
                <EditRowStyle BackColor="#2461BF" />
                <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
                <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
                <HeaderStyle BackColor="#507CD1" CssClass="HeaderStyle" Font-Bold="True" ForeColor="White" />
                <AlternatingRowStyle BackColor="White" />
            </asp:GridView>
            <asp:SqlDataSource ID="UnApproved_DS" runat="server" ConnectionString="<%$ ConnectionStrings:Seamless_MainWebConnection %>"
                ProviderName="<%$ ConnectionStrings:Seamless_MainWebConnection.ProviderName %>"
                SelectCommand="SELECT af.AffiliateID,af.AffiliateCode, af.FirstName, af.LastName,
                af.Username, af.EmailAddress, af.SignupDate, af.SignupIP,
                pm.ADTitle, af.Active FROM Affiliate af INNER JOIN Promotion
                pm ON af.PromotionID = pm.PromotionID ORDER BY af.SignupDate DESC">
            </asp:SqlDataSource>
        </td>
    </tr>
    <tr>
        <td>
            <asp:DetailsView ID="UnApprovedAccountDetails" runat="server" AutoGenerateRows="False" CellPadding="4"
                DataSourceID="Unapproved" ForeColor="#333333" GridLines="None" Height="50px"
                Width="268px">
                <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                <CommandRowStyle BackColor="#D1DDF1" Font-Bold="True" />
                <EditRowStyle BackColor="#2461BF" />
                <RowStyle BackColor="#EFF3FB" />
                <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
                <Fields>
                    <asp:BoundField DataField="AffiliateCode" HeaderText="Affiliate Code" ReadOnly="True"
                        SortExpression="AffiliateCode" />
                    <asp:BoundField DataField="FirstName" HeaderText="First Name" SortExpression="FirstName" />
                    <asp:BoundField DataField="LastName" HeaderText="Last Name" SortExpression="LastName" />
                    <asp:BoundField DataField="Username" HeaderText="Username" SortExpression="Username" />
                    <asp:BoundField DataField="Password" HeaderText="Password" SortExpression="Password" />
                    <asp:BoundField DataField="EmailAddress" HeaderText="Email Address" SortExpression="EmailAddress" />
                    <asp:BoundField DataField="SignupDate" HeaderText="Signup Date" ReadOnly="True" SortExpression="SignupDate" />
                    <asp:BoundField DataField="SignupIP" HeaderText="Signup IP" ReadOnly="True" SortExpression="SignupIP" />
                    <asp:BoundField DataField="PromotionID" HeaderText="Promotion ID" SortExpression="PromotionID" />
                    <asp:BoundField DataField="Points" HeaderText="Points" ReadOnly="True" SortExpression="Points" />
                    <asp:BoundField DataField="Active" HeaderText="Active" SortExpression="Active" />
                    <asp:BoundField DataField="ActivatedAdminUser" HeaderText="Activated Admin User"
                        ReadOnly="True" SortExpression="ActivatedAdminUser" />
                    <asp:BoundField DataField="Notes" HeaderText="Notes" SortExpression="Notes" />
                    <asp:CommandField ButtonType="Button" ControlStyle-CssClass="btn" DeleteText="Delete Account" EditText="Edit Affiliate Account"
                        ShowDeleteButton="True" ShowEditButton="True" />
                </Fields>
                <FieldHeaderStyle BackColor="#DEE8F5" Font-Bold="True" />
                <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                <AlternatingRowStyle BackColor="White" />
            </asp:DetailsView>
            <asp:SqlDataSource ID="Unapproved" runat="server" ConnectionString="<%$ ConnectionStrings:Seamless_MainWebConnection %>"
                ProviderName="<%$ ConnectionStrings:Seamless_MainWebConnection.ProviderName %>"
                OldValuesParameterFormatString="original_{0}"
                SelectCommand=" SELECT [AffiliateID],[AffiliateCode], [FirstName], [LastName],
                [Username], [Password], [EmailAddress], [SignupDate], [SignupIP],
                [PromotionID], [Points], [Active], [ActivatedAdminUser], [Notes] FROM
                [Affiliate] WHERE ([AffiliateID] = @AffiliateID)">
                <SelectParameters>
                    <asp:ControlParameter ControlID="UnapprovedAccountGrid" Name="AffiliateID"
                                PropertyName="SelectedIndex" Type="int32" />
                </SelectParameters>
            </asp:SqlDataSource>
           
        </td>
    </tr>
</table>
ResortCompaniesAsked:
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rboyd56Commented:
This variable, @AffiliateID, is being passed to the last select statement:

SELECT [AffiliateID],[AffiliateCode], [FirstName], [LastName],
                [Username], [Password], [EmailAddress], [SignupDate], [SignupIP],
                [PromotionID], [Points], [Active], [ActivatedAdminUser], [Notes] FROM
                [Affiliate] WHERE ([AffiliateID] = @AffiliateID)

Where is it being declared and assigned a value?
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ResortCompaniesAuthor Commented:
As far as I know:

<SelectParameters>
                    <asp:ControlParameter ControlID="UnapprovedAccountGrid" Name="AffiliateID"
                                PropertyName="SelectedIndex" Type="int32" />
                </SelectParameters>

Unless I am suppose to declare somewhere else?
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ResortCompaniesAuthor Commented:
I have found the answer myself.  SQL statement should be "WHERE AffiliateID = ?" rather then " = @AffiliateID"
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