using System;
using System.Runtime.InteropServices;
using System.Diagnostics;

namespace FileHandlerNS {
  public class FileHandler {

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
    public struct SHFILEOPSTRUCT {
      public IntPtr hwnd;
      public UInt32 wFunc;
      public string pFrom;
      public string pTo;
      public UInt16 fFlags;
      public Int32 fAnyOperationsAborted;
      public IntPtr hNameMappings;
      [MarshalAs(UnmanagedType.LPWStr)]
      public String lpszProgressTitle;
    }

    [DllImport("shell32.dll" , CharSet = CharSet.Unicode)]
    public static extern Int32 SHFileOperation(ref SHFILEOPSTRUCT lpFileOp);

    const int FO_DELETE = 3;
    const int FOF_ALLOWUNDO = 0x40;
    const int FOF_NOCONFIRMATION = 0x10;

    public static void DeleteFile(string fname) {
      SHFILEOPSTRUCT shf = new SHFILEOPSTRUCT();
      shf.hwnd = IntPtr.Zero;
      shf.wFunc = (uint) FO_DELETE;
      shf.fFlags = (ushort) FOF_ALLOWUNDO | FOF_NOCONFIRMATION;
      shf.pTo = fname;
      shf.fAnyOperationsAborted = 0;
      shf.hNameMappings = IntPtr.Zero;
      SHFileOperation(ref shf);
    }
  }
}