does ultrawebgrid support such thing as agregatting api? for example i want find sum (sql 'sum') by selected column. can i make it so grid return me a number of sum of this column?
Yep, we do provide a separate component for that - it is called WebCalcManager and plugs nicely with the grid API. You can check out the following sample for details:
And in general, if you go to our samples page at
http://samples.infragistics.com/2008.2/webfeaturebrowser/default.htm
you can check out several WebCalcManager samples (in the grid section, at the very bottom)