to make things short, i am writing a web app which implements users and groups. multiple users have multiple groups. that leaves me with three tables: user, group, usergroup.now i have a webform in which i want to manage groups and their members. for this, i have two gridviews on said form. one is for displaying the groups, another for displaying the members of the selected group.the group-gridview hast two columns: description and another where a buttonfield resides which says "display members". when the user clicks this button, he will get a list of users based on the selected group in the other gridview.however, i dont really have a clue how to do this? can you please point me in the right direction here?here is my code:\[code\]<asp:Content ID="content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server"><h1>Gruppenverwaltung</h1> <aspanel ID="pnlGruppe" ScrollBars="Both" runat="server"> <asp:Button ID="btnNeueGruppe" Text="Neue Gruppe" runat="server" OnClick="btnNeueGruppe_Click" /> <asp:GridView DataKeyNames="GruppenID" OnRowCommand="grdGruppe_RowCommand" ID="grdGruppe" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1"> <Columns> <asp:BoundField DataField="Bezeichnung" HeaderText="Bezeichnung" SortExpression="Bezeichnung" /> <asp:ButtonField ButtonType="Button" CommandName="MitgliederAnzeigen" Text="Mitglieder anzeigen" /> <asp:CommandField HeaderText="Archivieren" ButtonType="Button" ShowDeleteButton="true" /> </Columns> </asp:GridView> <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" SelectCommand="SELECT [Bezeichnung], [GruppenID] FROM [Gruppe] WHERE [Archiviert] != 1" DeleteCommand="UPDATE Gruppe SET [Archiviert] = 1 WHERE [GruppenID] = @GruppenID"></asp:SqlDataSource> <asp:Button ID="btnZurueck" Text="Zur