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gridview not populating with drop down values

Posted By:      Posted Date: October 07, 2010    Points: 0   Category :ASP.Net
 

when testing my query in the grid configuration wizard it works fine, but when i run the page it does not.

first - i select values from my cascading drop down list then enter values for two textbox (dates). then when i hit the button to populate my grid nothing is return back.

        <asp:GridView ID="gv1" runat="server" AutoGenerateColumns="False" 
            DataSourceID="SqlDataSource4">
            <Columns>
                <asp:BoundField DataField="FlyingFrom" HeaderText="FlyingFrom" 
                    SortExpression="FlyingFrom" />
                <asp:BoundField DataField="FlyingTo" HeaderText="FlyingTo" 
                    SortExpression="FlyingTo" />
                <asp:BoundField DataField="FlyingOutDate" HeaderText="FlyingOutDate" 
                    SortExpression="FlyingOutDate" />
                <asp:BoundField DataField="ReturnDate" HeaderText="ReturnDate" 
                    SortExpression="ReturnDate" />
            </Columns>
        </asp:GridView>

        
        <asp:SqlDataSource ID="SqlDataSource4" runat="server" 
            Connectio


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