Process.GetProcessById Method (Int32)


Returns a new Process component, given the identifier of a process on the local computer.

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

public static Process GetProcessById(
	int processId


Type: System.Int32

The system-unique identifier of a process resource.

Return Value

Type: System.Diagnostics.Process

A Process component that is associated with the local process resource identified by the processId parameter.

Exception Condition

The process specified by the processId parameter is not running. The identifier might be expired.


The process was not started by this object.

Use this method to create a new Process component and associate it with a process resource on the local computer. The process resource must already exist on the computer, because GetProcessById(Int32) does not create a system resource, but rather associates a resource with an application-generated Process component. A process Id can be retrieved only for a process that is currently running on the computer. After the process terminates, GetProcessById(Int32) throws an exception if you pass it an expired identifier.

On any particular computer, the identifier of a process is unique. GetProcessById(Int32) returns one process at most. If you want to get all the processes running a particular application, use GetProcessesByName(String). If multiple processes exist on the computer running the specified application, GetProcessesByName(String) returns an array containing all the associated processes. You can query each of these processes in turn for its identifier. The process identifier can be viewed in the Processes panel of the Windows Task Manager. The PID column displays the process identifier that is assigned to a process.

The following example retrieves information of the current process, processes running on the local computer, all instances of Notepad running on the local computer, and a specific process on the local computer. It then retrieves information for the same processes on a remote computer.

using System;
using System.Diagnostics;
using System.ComponentModel;

namespace MyProcessSample
    class MyProcess
        void BindToRunningProcesses()
            // Get the current process.
            Process currentProcess = Process.GetCurrentProcess();

            // Get all processes running on the local computer.
            Process[] localAll = Process.GetProcesses();

            // Get all instances of Notepad running on the local computer.
            // This will return an empty array if notepad isn't running.
            Process[] localByName = Process.GetProcessesByName("notepad");

            // Get a process on the local computer, using the process id.
            // This will throw an exception if there is no such process.
            Process localById = Process.GetProcessById(1234);

            // Get processes running on a remote computer. Note that this
            // and all the following calls will timeout and throw an exception
            // if "myComputer" and do not exist on your local network.

            // Get all processes on a remote computer.
            Process[] remoteAll = Process.GetProcesses("myComputer");

            // Get all instances of Notepad running on the specific computer, using machine name.
            Process[] remoteByName = Process.GetProcessesByName("notepad", "myComputer");

            // Get all instances of Notepad running on the specific computer, using IP address.
            Process[] ipByName = Process.GetProcessesByName("notepad", "");

            // Get a process on a remote computer, using the process id and machine name.
            Process remoteById = Process.GetProcessById(2345, "myComputer");

        static void Main()
            MyProcess myProcess = new MyProcess();

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

.NET Framework
Available since 1.1
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