Debugging and diagnosing lock convoying problems in .NET

Question

I am looking into performance issues of a large C#/.NET 3.5 system that exhibits performance degradation as the number of users making requests scales up to 40-50 distinct user

Answer 1

A good place to start is by having a look at the Lock and Thread performance counters. Out of interesting what exactly are you locking for in your Web app? Locking in most ASP.NET applications isn't common.