This documentation is archived and is not being maintained.

Process.WorkingSet Property

NOTE: This API is now obsolete.

Gets the associated process's physical memory usage.

Namespace:  System.Diagnostics
Assembly:  System (in System.dll)

[ObsoleteAttribute("This property has been deprecated.  Please use System.Diagnostics.Process.WorkingSet64 instead.")]
public int WorkingSet { get; }

Property Value

Type: System.Int32
The total amount of physical memory the associated process is using, in bytes.


The platform is Windows 98 or Windows Millennium Edition (Windows Me), which does not support this property.

The working set of a process is the set of memory pages currently visible to the process in physical RAM memory. These pages are resident and available for an application to use without triggering a page fault.

The working set includes both shared and private data. The shared data includes the pages that contain all the instructions that the process executes, including the process modules and the system libraries.

The following example starts an instance of Notepad. The example then retrieves and displays various properties of the associated process. The example detects when the process exits, and displays the process's exit code.

using System;
using System.Diagnostics;
using System.Threading;

namespace Process_Sample
   class MyProcessClass
      public static void Main()

            Process myProcess;
            myProcess = Process.Start("NotePad.exe");


               // Get physical memory usage of the associated process.
               Console.WriteLine("Process's physical memory usage: " + myProcess.WorkingSet);
               // Get base priority of the associated process.
               Console.WriteLine("Base priority of the associated process: " + myProcess.BasePriority);
               // Get priority class of the associated process.
               Console.WriteLine("Priority class of the associated process: " + myProcess.PriorityClass);
               // Get user processor time for this process.
               Console.WriteLine("User Processor Time: " + myProcess.UserProcessorTime);
               // Get privileged processor time for this process.
               Console.WriteLine("Privileged Processor Time: " + myProcess.PrivilegedProcessorTime);
               // Get total processor time for this process.
               Console.WriteLine("Total Processor Time: " + myProcess.TotalProcessorTime);
               // Invoke overloaded ToString function.
               Console.WriteLine("Process's Name: " + myProcess.ToString());

                  Console.WriteLine("Status:  Responding to user interface");
                  Console.WriteLine("Status:  Not Responding");


            Console.WriteLine("Process exit code: {0}", myProcess.ExitCode);
         catch(Exception e)
            Console.WriteLine("The following exception was raised: " + e.Message);


  • LinkDemand 

    for full trust for the immediate caller. This member cannot be used by partially trusted code.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 1.1, 1.0
Obsolete (compiler warning) in 3.5
Obsolete (compiler warning) in 3.5 SP1
Obsolete (compiler warning) in 3.0
Obsolete (compiler warning) in 3.0 SP1
Obsolete (compiler warning) in 3.0 SP2
Obsolete (compiler warning) in 2.0
Obsolete (compiler warning) in 2.0 SP1
Obsolete (compiler warning) in 2.0 SP2