Directory.CreateDirectory Method (String)


Creates all directories and subdirectories in the specified path unless they already exist.

Namespace:   System.IO
Assembly:  mscorlib (in mscorlib.dll)

Public Shared Function CreateDirectory (
	path As String
) As DirectoryInfo


Type: System.String

The directory to create.

Return Value

Type: System.IO.DirectoryInfo

An object that represents the directory at the specified path. This object is returned regardless of whether a directory at the specified path already exists.

Exception Condition

The directory specified by path is a file.


The network name is not known.


The caller does not have the required permission.


path is a zero-length string, contains only white space, or contains one or more invalid characters. You can query for invalid characters by using the GetInvalidPathChars method.


path is prefixed with, or contains, only a colon character (:).


path is null.


The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters and file names must be less than 260 characters.


The specified path is invalid (for example, it is on an unmapped drive).


path contains a colon character (:) that is not part of a drive label ("C:\").

Any and all directories specified in path are created, unless they already exist or unless some part of path is invalid. If the directory already exists, this method does not create a new directory, but it returns a DirectoryInfo object for the existing directory.

The path parameter specifies a directory path, not a file path.

Trailing spaces are removed from the end of the path parameter before creating the directory.

You can create a directory on a remote computer, on a share that you have write access to. UNC paths are supported; for example, you can specify the following for path: \\2009\Archives\December in Visual Basic, and \\\\2009\\Archives\\December in C#.

Creating a directory with only the colon character (:) is not supported, and will cause a NotSupportedException to be thrown.

The following example creates and deletes the specified directory.

Imports System
Imports System.IO
Imports Microsoft.VisualBasic

Public Class Test
    Public Shared Sub Main()
        ' Specify the directory you want to manipulate.
        Dim path As String = "c:\MyDir"

            ' Determine whether the directory exists.
            If Directory.Exists(path) Then
                Console.WriteLine("That path exists already.")
            End If

            ' Try to create the directory.
            Dim di As DirectoryInfo = Directory.CreateDirectory(path)
            Console.WriteLine("The directory was created successfully at {0}.", Directory.GetCreationTime(path))

            ' Delete the directory.
            Console.WriteLine("The directory was deleted successfully.")

        Catch e As Exception
            Console.WriteLine("The process failed: {0}.", e.ToString())
        End Try
    End Sub
End Class

To create the directory C:\Users\User1\Public\Html when the current directory is C:\Users\User1, use any of the following calls to ensure that the backslash is interpreted properly.

In Visual Basic:


In C#:


In C++:



for reading and writing files or directories. Associated enumerations: FileIOPermissionAccess.Read, FileIOPermissionAccess.Write

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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