ASP.NET display specific value from Gridview

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ASP.NET

Gridview

I want to show value in gridview for specific user. In 'Test Query' it works fine, but didn't show value on page. What's wrong?

        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1" Width="698px" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" DataKeyNames="Idoferty">
            <Columns>
                <asp:BoundField DataField="Idoferty" HeaderText="Idoferty" SortExpression="Idoferty" />
            </Columns>
        </asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ofety_stopowiczeV1ConnectionString %>" SelectCommand="SELECT [Idoferty] FROM [rezerwacje] WHERE ([user] = @user)">
                <SelectParameters>
                    <asp:SessionParameter Name="user" SessionField="User.Identity.Name" Type="String" />
                </SelectParameters>
            </asp:SqlDataSource>

SELECT statement

SELECT [Idoferty] FROM [rezerwacje] WHERE ([user] = @user)