During testing or monitoring, there is a constant need to monitor the number of sessions created, so as to better correlate the performance metrics collected. The Performance Monitor tool is typically used to collect performance metrics.
In performance monitor, follow these steps to monitor the number of sessions. In the performance monitor properties, under the Data section, click on “Add” From the counters listed, select Asp.Net State Service and State Server Sessions Total. This will be listed on the data collected.