>>>>Thanks a lot in advance.
>>>
>>>

>>>prefsRetailViewModel.AvailableTrackingColumns = this.trackingLookupOrderColumns.Keys.Except(prefsRetailViewModel.Keys);

>>
>>This is close, but also not working. The AvailableTrackingColumns is also a Dictionary, so I need to get them with the values. If I can get a list of keys with the above method, can I then somehow grab that portion of the Dictionary (using these keys) in one simple call?
>>
>>I can, of course, just iterate through keys, but I wanted to use LINQ capabilities and I'm sure there is some smart way of grabbing the relevant dictionary entries.
>
>
>something along this line (not tested):
>
>

>var result = newDic
>    .Where(kvp => !oldDic.ContainsKey(kvp.Key))
>    .ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
>

Got it compiled, thanks a lot. Going to test now.