CS: order the using statements. First BCL ones (System.*) then External ones (like agsXMPP) then own ones (Smuxi.*). In each section sort by shortest length by sub-namespaces, like this:

    using agsXMPP.protocol.x.muc;
    using agsXMPP.protocol.client;
    using agsXMPP.protocol.iq;
    using agsXMPP.protocol.iq.roster;