ProcessStartInfo Class

Specifies a set of values that are used when you start a process.

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

public sealed class ProcessStartInfo
/** @attribute TypeConverterAttribute(System.ComponentModel.ExpandableObjectConverter) */ 
public final class ProcessStartInfo
public final class ProcessStartInfo
Not applicable.

ProcessStartInfo is used together with the Process component. When you start a process using the Process class, you have access to process information in addition to that available when attaching to a running process.

You can use the ProcessStartInfo class for better control over the process you start. You must at least set the FileName property, either manually or using the constructor. The file name is any application or document. Here a document is defined to be any file type that has an open or default action associated with it. You can view registered file types and their associated applications for your computer by using the Folder Options dialog box, which is available through the operating system. The Advanced button leads to a dialog box that shows whether there is an open action associated with a specific registered file type.

In addition, you can set other properties that define actions to take with that file. You can specify a value specific to the type of the FileName property for the Verb property. For example, you can specify "print" for a document type. Additionally, you can specify Arguments property values to be command-line arguments to pass to the file's open procedure. For example, if you specify a text editor application in the FileName property, you can use the Arguments property to specify a text file to be opened by the editor.

Standard input is usually the keyboard, and standard output and standard error are usually the monitor screen. However, you can use the RedirectStandardInput, RedirectStandardOutput, and RedirectStandardError properties to cause the process to get input from or return output to a file or other device. If you use the StandardInput, StandardOutput, or StandardError properties on the Process component, you must first set the corresponding value on the ProcessStartInfo property. Otherwise, the system throws an exception when you read or write to the stream.

Set UseShellExecute to specify whether to start the process by using the operating system shell.

You can change the value of any ProcessStartInfo property up to the time that the process starts. After you start the process, changing these values has no effect.


This class contains a link demand at the class level that applies to all members. A SecurityException is thrown when the immediate caller does not have full-trust permission. For details about security demands, see Link Demands.

The following code example demonstrates how to use the ProcessStartInfo class to start Internet Explorer, providing the destination URLs as ProcessStartInfo arguments.

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

namespace MyProcessSample
	/// <summary>
	/// Shell for the sample.
	/// </summary>
	class MyProcess
		/// <summary>
		/// Opens the Internet Explorer application.
		/// </summary>
		void OpenApplication(string myFavoritesPath)
			// Start Internet Explorer. Defaults to the home page.
		    // Display the contents of the favorites folder in the browser.
		/// <summary>
		/// Opens urls and .html documents using Internet Explorer.
		/// </summary>
		void OpenWithArguments()
			// url's are not considered documents. They can only be opened
			// by passing them as arguments.
			Process.Start("IExplore.exe", "");
			// Start a Web page using a browser associated with .html and .asp files.
			Process.Start("IExplore.exe", "C:\\myPath\\myFile.htm");
			Process.Start("IExplore.exe", "C:\\myPath\\myFile.asp");
		/// <summary>
		/// Uses the ProcessStartInfo class to start new processes, both in a minimized 
		/// mode.
		/// </summary>
		void OpenWithStartInfo()
			ProcessStartInfo startInfo = new ProcessStartInfo("IExplore.exe");
			startInfo.WindowStyle = ProcessWindowStyle.Minimized;
			startInfo.Arguments = "";

		static void Main()
            		// Get the path that stores favorite links.
            		string myFavoritesPath = 
            		MyProcess myProcess = new MyProcess();



Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0