Process.SynchronizingObject Property


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Gets or sets the object used to marshal the event handler calls that are issued as a result of a process exit event.

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

public ISynchronizeInvoke SynchronizingObject { get; set; }

Property Value

Type: System.ComponentModel.ISynchronizeInvoke

The ISynchronizeInvoke used to marshal event handler calls that are issued as a result of an Exited event on the process.

When SynchronizingObject is null, methods that handle the Exited event are called on a thread from the system thread pool. For more information about system thread pools, see ThreadPool.

When the Exited event is handled by a visual Windows Forms component, such as a Button, accessing the component through the system thread pool might not work, or might result in an exception. Avoid this by setting SynchronizingObject to a Windows Forms component, which causes the methods handling the Exited event to be called on the same thread on which the component was created.

If the Process is used inside Visual Studio 2005 in a Windows Forms designer, SynchronizingObject is automatically set to the control that contains the Process. For example, if you place a Process on a designer for Form1 (which inherits from Form) the SynchronizingObject property of Process is set to the instance of Form1:

this.process1.StartInfo.Domain = "";
this.process1.StartInfo.LoadUserProfile = false;
this.process1.StartInfo.Password = null;
this.process1.StartInfo.StandardErrorEncoding = null;
this.process1.StartInfo.StandardOutputEncoding = null;
this.process1.StartInfo.UserName = "";
this.process1.SynchronizingObject = this;

Typically, this property is set when the component is placed inside a control or form, because those components are bound to a specific thread.

   private MyButton button1;
   private void button1_Click(object sender, System.EventArgs e)
      Process myProcess = new Process();
      ProcessStartInfo myProcessStartInfo= new ProcessStartInfo("mspaint");
      myProcess.StartInfo = myProcessStartInfo;
      myProcess.Exited += new EventHandler(MyProcessExited);
      // Set 'EnableRaisingEvents' to true, to raise 'Exited' event when process is terminated.
      myProcess.EnableRaisingEvents = true;
      // Set method handling the exited event to be called  ;
      // on the same thread on which MyButton was created.
      myProcess.SynchronizingObject = button1;
      MessageBox.Show("Waiting for the process 'mspaint' to exit....");
   private void MyProcessExited(Object source, EventArgs e)
      MessageBox.Show("The process has exited.");

public class MyButton:Button



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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