<asp:GridView ID="GridView1" AllowPaging="true" runat="server" AutoGenerateColumns="False" 
        DataSourceID="SqlDataSource1" PageSize="8" OnRowCommand="GridView1_RowCommand" DataKeyNames="qwnome" >
        <Columns>
            <asp:BoundField DataField="id" HeaderText="id" 
                SortExpression="id" Visible="false" />
            <asp:BoundField DataField="qwnome" HeaderText="qwnome" 
                SortExpression="qwnome" DataFormatString="&lt;img src='../images/catalogo/{0}' /&gt;" />
            <asp:BoundField DataField="qwstato" HeaderText="qwstato" 
                SortExpression="qwstato" Visible="false" />            
            <asp:ButtonField CommandName="sostituisci" ImageUrl="images/editImm.png" 
                Text="<img src='images/editImm.png'/>" HeaderText="sostituisci"  />          
            
        </Columns>
    </asp:GridView>