SQL request issue between SQL Server & Visual Studio Web Dev.

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ASP.NET

SQL-Server

Hello everybody,
i'm developing a asp.net web page which display data from a SQL Server.
All works fine however, when i add new data on my SQL Data Base they don't appear in the gridview.
I've tested my request in the tool on Visual Studio Web Developer the same problem, so I thought that my request is wrong !
However in SQL Server Management Studio Express there are no problems all my data appear with the same request.

This is a kind of bug or something i forget to set ?
Thanks you

<asp:Content ID="Content3" runat="server"
    contentplaceholderid="ContentPlaceHolder2">
    <asp:GridView ID="GridView1" runat="server"
    AutoGenerateColumns="False" DataSourceID="SqlDataSource1" Height="683px"
    Width="643px" style="margin-left: 0px">
                        <Columns>
                            <asp:BoundField DataField="adacc" HeaderText="Account" SortExpression="adacc" />
                            <asp:BoundField DataField="department" HeaderText="Department"
                                SortExpression="department" />
                            <asp:BoundField DataField="SPE" HeaderText="SPE"
                                SortExpression="SPE" />
                            <asp:BoundField DataField="hostname" HeaderText="Hostname"
                                SortExpression="hostname" />
                            <asp:BoundField DataField="location" HeaderText="Location"
                                SortExpression="location" />
                            <asp:BoundField DataField="software" HeaderText="Software"
                                SortExpression="software" />
                            <asp:BoundField DataField="genacc_user_adacc" HeaderText="Users"
                                SortExpression="genacc_user_adacc" />
                            <asp:BoundField DataField="pass" HeaderText="pass" SortExpression="PWD Encrypted" />
                        </Columns>
</asp:GridView>
<!-- SQL Request without login dectection ((    <%Response.Write(getuserID)%>    ))-->
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
                EnableCaching="True"
                FilterExpression="genacc_user_adacc = 'HERMANS5'"
                ConnectionString="<%$ ConnectionStrings:LabAccManConnectionString %>"

        SelectCommand="SELECT     genacc_account.adacc, genacc_account.department, genacc_account.SPE, genacc_machines.hostname, genacc_machines.location,
                      genacc_machines.software, account_user.genacc_user_adacc, genacc_pw.pass
FROM         genacc_account INNER JOIN
                      genacc_machines ON genacc_account.id = genacc_machines.genacc_account_id INNER JOIN
                      account_user ON genacc_account.id = account_user.genacc_account_id INNER JOIN
                      genacc_pw ON genacc_account.id = genacc_pw.genacc_account_id">


</asp:SqlDataSource>