using System;
using System.IO;
using System.Runtime.InteropServices;
namespace ConsoleApplication5
{
    class Program
    {
        /// <summary>
        /// Create an structure which will store recycle query information.
        /// </summary>
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Pack = 1)]
        public struct SHQUERYRBINFO
        {
            public Int32 cbSize;
            public UInt64 i64Size;
            public UInt64 i64NumItems;
        }
        /// <summary>
        /// Call SHQueryRecycleBin() method of shell32 dll to query file size and file number
        /// in recycle bin.
        /// </summary>
        [DllImport("shell32.dll", CharSet = CharSet.Unicode)]
        public static extern int SHQueryRecycleBin(
                [MarshalAs(UnmanagedType.LPTStr)]
                String pszRootPath,
                ref SHQUERYRBINFO pSHQueryRBInfo
            );
        enum RecycleFlags : int
        {
            SHERB_NOCONFIRMATION = 0x00000001,          //No confirmation dialog will open while emptying recycle bin.
            SHERB_NOPROGRESSUI = 0x00000001,            //No progress tracking window appears while emptying recycle bin.
            SHERB_NOSOUND = 0x00000004                  //No sound whent while emptying recycle bin.
        }
        /// <summary>
        /// Call SHEmptyRecycleBin() method of shell32 dll to empty recycle bin.
        /// </summary>
        [System.Runtime.InteropServices.DllImport("Shell32.dll")]
        static extern int SHEmptyRecycleBin(IntPtr hwnd, string psrRootPath, RecycleFlags dwFlags);
        /// <summary>
        /// This method will empty recycle bin without prompting confirmation message.
        /// </summary>
        public static void emptyRecycleBin()
        {
            SHEmptyRecycleBin(IntPtr.Zero, null, RecycleFlags.SHERB_NOCONFIRMATION);            
        }
        static void Main(string[] args)
        {
            SHQUERYRBINFO bb_Query = new SHQUERYRBINFO();
            bb_Query.cbSize = Marshal.SizeOf(bb_Query.GetType());
            SHQueryRecycleBin(null, ref bb_Query);
            Console.WriteLine("CB Size  :  " + bb_Query.cbSize);
            Console.WriteLine("File Size   :  " + bb_Query.i64Size);  //Call i64Size member of structure which will return size of recycle bin.
            Console.WriteLine("Number of items   :  " + bb_Query.i64NumItems);  //Call i64NumItems member of structure which will return file number in recycle bin.
            emptyRecycleBin();   //call empty recycle bin which will empty ur recycle bin.
        }
    }
}