I have two generic lists, both containing different data, except 4 fields, which I want to compare to another list and find items that do not match in either list.

I need to basically replace where it says equals below, with not equals!

var unMatchedData = from liveLines in liveList
    join oldList in comapreSnapshotList
    on new {liveLines.ClientNo, liveLines.SequenceNo, liveLines.LineNo, liveLines.Text} equals
    new {oldList.ClientNo, oldList.SequenceNo, oldList.LineNo, oldList.Text}
    select new KNOWTXTS
    {
        ClientNo = liveLines.ClientNo,
        SequenceNo = liveLines.SequenceNo,
        LineNo = liveLines.LineNo,
        Text = liveLines.Text
    };