Hi,
If you want pre-calculated result is SQL Server, you are not in OLTP model, but you are using OLAP (Data Warehousing).
The only pre-calculated result is in DMV views (for OLTP Database)
http://msdn.microsoft.com/en-us/library/ms188754.aspx[
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For table count rows you can use :
select rows from sys.partitions where object_name(object_id) = 'ABC'
You can use also new feature in SQL Server for OLTP called 'StreamInsight'
http://technet.microsoft.com/fr-fr/library/ee362541%28v=sql.111%29.aspx[
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This feature allows raising call back event to the ASP client(Using SingalR), when your enumerated conditions is true.
Hope that help,
Béchir.