Gets the unique identifier for the associated process.
Assembly: System (in System.dll)
The process'sproperty has not been set.
There is no process associated with this Process object.
The platform is Windows 98 or Windows Millennium Edition (Windows Me); set the ProcessStartInfo::UseShellExecute property to false to access this property on Windows 98 and Windows Me.
The processis not valid if the associated process is not running. Therefore, you should ensure that the process is running before attempting to retrieve the property. Until the process terminates, the process identifier uniquely identifies the process throughout the system.
You can connect a process that is running on a local or remote computer to a new Process instance by passing the process identifier to the GetProcessById method. GetProcessById is a static method that creates a new component and sets the property for the new Process instance automatically.
Process identifiers can be reused by the system. Theproperty value is unique only while the associated process is running. After the process has terminated, the system can reuse the property value for an unrelated process.
Because the identifier is unique on the system, you can pass it to other threads as an alternative to passing a Process instance. This action can save system resources yet guarantee that the process is correctly identified.
This property is not available on this platform if you started the process with ProcessStartInfo::UseShellExecute set to true.
The following example demonstrates how to obtain thefor all running instances of an application. The code creates a new instance of Notepad, lists all the instances of Notepad, and then allows the user to enter the number to remove a specific instance.
for full trust for the immediate caller. This member cannot be used by partially trusted code.
Available since 1.1