C# Definition:

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]

struct SHFILEOPSTRUCT

{

    public IntPtr hwnd;
    public FILEOP_FLAGS wFunc;
    [MarshalAs(UnmanagedType.LPWStr)]
    public string pFrom;
    [MarshalAs(UnmanagedType.LPWStr)]
    public string pTo;
    public ushort fFlags;
    //typedef int BOOL; (in platform SDK)
    //BOOL fAnyOperationsAborted; (in platform SDK)
    //public bool fAnyOperationsAborted;
    public Int32 fAnyOperationsAborted;
    public IntPtr hNameMappings;
    [MarshalAs(UnmanagedType.LPWStr)]
    public string lpszProgressTitle;

}

VB Definition:

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)> _
Public Structure SHFILEOPSTRUCT
    Public hwnd As IntPtr
    Public wFunc As FO_Func
    <MarshalAs(UnmanagedType.LPWStr)> _
    Public pFrom As String
    <MarshalAs(UnmanagedType.LPWStr)> _
    Public pTo As String
    Public fFlags As FILEOP_FLAGS
    Public fAnyOperationsAborted As Boolean
    Public hNameMappings As IntPtr
    <MarshalAs(UnmanagedType.LPWStr)> _
    Public lpszProgressTitle As String '  only used if FOF_SIMPLEPROGRESS
End Structure

User-Defined Field Types:

FILEOP_FLAGS

Notes:

I tried to use this to send files to the recycle bin. It failed (Marshal.GetLastWin32Error was 6, invalid handle) and sometimes threw a NullReferenceException. To make it work I did the following;

• Change from LPWStr to IntPtr for pFrom and pTo

    public IntPtr pFrom;
    public IntPtr pTo;

• Always set hwnd to my main app window (I was using IntPtr.Zero, this might not be required)
• Correctly treat pTo and pFrom as zero delimited double zero terminated.

In my case I only needed pTo so I just added a null byte to the end and used Marshal.StringToHGlobalUni() to set the value