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During normal operation the Upper Thermostat or "top switch" as you call it heats the top element first as Hay Zee 518 mentioned. If you have no hot water and the elements are good and there is 240 volts at the top of the upper thermostat and no power to the element and the reset is not out the upper thermostat is bad. You can usually slide it up from behind the spring tabs that hold it against the tank. Make sure you read the wiring diagrams to see the correct set up. There are several different upper thermostats that have screws in the same spots but have different wiring configurations based on the one you are removing.
If you have warm water the lower circuit is sometimes the problem, however based on the information you provided it could be the upper thermostat is not switching power to the lower thermostat.
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