C# Signature:

/// <summary>
/// Verifies that a path is a valid directory.
/// </summary>
/// <param name="pszPath">A pointer to a null-terminated string of maximum length MAX_PATH that contains the path to verify.</param>
/// <returns>Returns (BOOL)FILE_ATTRIBUTE_DIRECTORY if the path is a valid directory; otherwise, FALSE.</returns>
[System.Runtime.InteropServices.DllImport("shlwapi.dll", EntryPoint = "PathIsDirectoryW",  SetLastError = True, CharSet= CharSet.Unicode)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool PathIsDirectory([MarshalAs(UnmanagedType.LPTStr)]string pszPath);

VB.NET Signature:

''' <summary>
''' Verifies that a path is a valid directory.
''' </summary>
''' <param name="pszPath">A pointer to a null-terminated string of maximum length MAX_PATH that contains the path to verify.</param>
''' <returns>Returns (BOOL)FILE_ATTRIBUTE_DIRECTORY if the path is a valid directory; otherwise, FALSE.</returns>
<System.Runtime.InteropServices.DllImport("shlwapi.dll", EntryPoint:="PathIsDirectoryW",  SetLastError:=True, CharSet:=CharSet.Unicode)> _
Public Shared Function PathIsDirectory(<MarshalAs(UnmanagedType.LPTStr)>pszPath As String) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

VB Signature:

Public Declare Function PathIsDirectory Lib "shlwapi" Alias "PathIsDirectoryA" _
        (ByVal pszPath As String) As Long

User-Defined Types:

None.

Alternative Managed API:

C#: bool System.IO.Directory.Exists(string path)
VB.Net: System.IO.Directory.Exists(path as String) as Boolean

https://msdn.microsoft.com/en-us/library/system.io.directory.exists.aspx

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

Please add some!