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enum RecycleFlags : uint
        {
            SHERB_NOCONFIRMATION = 0x00000001,
            SHERB_NOPROGRESSUI = 0x00000001,
            SHERB_NOSOUND = 0x00000004
        }

        [DllImport("Shell32.dll", CharSet = CharSet.Unicode)]
        static extern uint SHEmptyRecycleBin(IntPtr hwnd, string pszRootPath,
        RecycleFlags dwFlags);


//The follwing code does the emying
 uint result = SHEmptyRecycleBin(IntPtr.Zero, null, 0);


//Here is a full app, on load it empties the bin.


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;//Need for DLL import

using System.IO;

namespace RBinTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            uint result = SHEmptyRecycleBin(IntPtr.Zero, null, 0);
            //empties on load
        }

        enum RecycleFlags : uint
        {
            SHERB_NOCONFIRMATION = 0x00000001,
            SHERB_NOPROGRESSUI = 0x00000001,
            SHERB_NOSOUND = 0x00000004
        }

        [DllImport("Shell32.dll", CharSet = CharSet.Unicode)]
        static extern uint SHEmptyRecycleBin(IntPtr hwnd, string pszRootPath,
        RecycleFlags dwFlags);
    }
}
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