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List<Tuple<T1,T2>> as DataSource for GridView
List<Tuple<Group, string>> userGroups = Util.PrepareGroups((string[][])Session["userGroups"]);
            gridGroups.DataSource = userGroups;
            gridGroups.DataBind();

<asp:GridView runat="server" ID="gridGroups" CssClass="grid gridGroups" AutoGenerateColumns="false">
            <Columns>
            <asp:BoundField meta:resourcekey="gridGroupsName" DataField="Item1.Name" />
            <asp:BoundField meta:resourcekey="gridGroupsFunction" DataField="Item2" />
            </Columns>
        </asp:GridView>