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HI,

I have 4 column field textbox.

i) Start Time
ii)End Time
iii) Idle Hours
iv) Nett Sort Time.

on which server event if when user click save on add and edit page.. the nett Sort time will calculate hours like this

Nett Sort Time : End Time - Start Time- Idle Hours
08:30 -06:30 -01:00

Thanks

You can use the Row_Inserting / Row_Updating server events to do the calculation.