Attach technique allows to load the profiler agent into running .NET runtime, but attached agent has several limitations in functionality. Attach is available in .NET Framework 4 or newer.
All detected locally running .NET applications are shown in the "Monitor Applications" list on Welcome screen. The colored circle indicates the profiler agent status. When agent is already loaded the circle is green. Orange circle shows that agent is not yet loaded but can be attached.
Run the command line tool to attach profiler agent and then connect from Welcome screen.
Not all profiling capabilities are available in the attach mode due to .NET Framework limitations listed below. To get all capabilities, application should be started with the profiler.