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    <p>It just affects the process it's called in (but will affect all <a href="http://it.toolbox.com/blogs/programming-life/enter-the-net-appdomain-5595" rel="nofollow noreferrer">Application Domains</a> in the process). However, be warned that this will not release the memory to the OS. If you want to release the memory to the OS, a way to do it is:</p> <pre><code>private static void minimizeMemory() { GC.Collect(GC.MaxGeneration); GC.WaitForPendingFinalizers(); SetProcessWorkingSetSize(Process.GetCurrentProcess().Handle, (UIntPtr) 0xFFFFFFFF, (UIntPtr) 0xFFFFFFFF); } [DllImport("kernel32.dll")] [return: MarshalAs(UnmanagedType.Bool)] private static extern bool SetProcessWorkingSetSize(IntPtr process, UIntPtr minimumWorkingSetSize, UIntPtr maximumWorkingSetSize); </code></pre> <p>The big caveat here is <em>why</em>. Unless you're noticing that memory is thrashing or swapping is a performance bottleneck (or you're writing an end-user app), there's no real reason to be concerned about memory usage. Forcing a GC can be slow. Reducing the heap will cause the heap to need to be re-allocated from VM. In addition, the .NET GC is reactive, using program behavior to increase its efficiency. By forcing a collection, you don't allow the GC to tune itself to your program's behavior, further reducing performance.</p> <p>I know this from experience -- I asked <a href="https://stackoverflow.com/questions/1343374/reducing-memory-usage-of-net-applications">this question</a> a while back and even came up with a timer-based class to call the method above after leaving a high-memory operation (run every 5 minutes). Following this, the process working set would reduce itself a lot -- by swapping it to disk. Over the next couple seconds, it would read back the most frequently used parts, a couple minutes later (when the task was run again), it would again do a bunch of allocation. Timing (not even profiling) the process showed that with the collection, there was about a 0.2s (!) slowdown during the allocation of VM from the OS for the task.</p>
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    1. COThe why... this service process needs to run every 10 minutes. The box also has an interactive service (sorta like citrix... but different) that allows users to connect. However, when the server runs low on ram, that citrix like service won't allow new connections.
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    2. COAh, I see. Then indeed, you'll want to be process reducing the working set size instead of just doing a GC (which just compacts the heap within the process).
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