ProcessStartInfo.Arguments Property


The .NET API Reference documentation has a new home. Visit the .NET API Browser on to see the new experience.

Gets or sets the set of command-line arguments to use when starting the application.

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

<TypeConverterAttribute("System.Diagnostics.Design.StringValueConverter, System.Design, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")>
Public Property Arguments As String

Property Value

Type: System.String

A single string containing the arguments to pass to the target application specified in the FileName property. The default is an empty string (""). On Windows Vista and earlier versions of the Windows operating system, the length of the arguments added to the length of the full path to the process must be less than 2080. On Windows 7 and later versions, the length must be less than 32699.

Arguments are parsed and interpreted by the target application, so must align with the expectations of that application. For.NET applications as demonstrated in the Examples below, spaces are interpreted as a separator between multiple arguments. A single argument that includes spaces must be surrounded by quotation marks, but those quotation marks are not carried through to the target application. In include quotation marks in the final parsed argument, triple-escape each mark.

The first example below creates a small application (argsecho.exe) that echos its arguments to the console. The second example creates an application that invokes argsecho.exe to demonstrate different variations for the Arguments property.

' Place this code into a console project called ArgsEcho to build the argsecho.exe target

Module Module1
    Sub Main()
        Dim i As Integer = 0

        For Each s As String In My.Application.CommandLineArgs
            Console.WriteLine("[" + i.ToString() + "] = " + s)
            i = i + 1

        Console.WriteLine(Environment.NewLine + "Press any key to exit")
    End Sub
End Module
' Place this code into a console project called StartArgsEcho. It depends on the
' console application named argsecho.exe.

Module Module1
    Sub Main()
        Dim startInfo As ProcessStartInfo = New ProcessStartInfo("argsecho.exe")
        startInfo.WindowStyle = ProcessWindowStyle.Normal

        ' Start with one argument.
        ' Output of ArgsEcho:
        '  [0]=/a            
        startInfo.Arguments = "/a"

        ' Start with multiple arguments separated by spaces.
        ' Output of ArgsEcho:
        '  [0] = /a
        '  [1] = /b
        '  [2] = c:\temp
        startInfo.Arguments = "/a /b c:\temp"

        ' An argument with spaces inside quotes is interpreted as multiple arguments.
        ' Output of ArgsEcho:
        '  [0] = /a
        '  [1] = literal string arg
        startInfo.Arguments = "/a ""literal string arg"" "

        ' An argument inside double quotes is interpreted as if the quote weren't there,
        ' that is, as separate arguments.
        ' Output of ArgsEcho:
        '  [0] = /a
        '  [1] = /b:string
        '  [2] = in
        '  [3] = double
        '  [4] = quotes
        startInfo.Arguments = "/a /b:""""string in double quotes"""" "

        ' Triple-escape quotation marks to include the character in the final argument received
        ' by the target process. 
        '  [0] = /a
        '  [1] = /b:"quoted string"
        startInfo.Arguments = "/a /b:""""""quoted string"""""" "
    End Sub
End Module

.NET Framework
Available since 1.1
Return to top