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/// <summary>
        /// Empties the Recycle Bin on the specified drive.
        /// </summary>
        /// <param name="hwnd">A handle to the parent window of any dialog boxes that might be displayed during the operation. This parameter can be NULL.</param>
        /// <param name="pszRootPath">The address of a null-terminated string of maximum length MAX_PATH that contains the path of the root drive on which the Recycle Bin is located. This parameter can contain the address of a string formatted with the drive, folder, and subfolder names, for example c:\windows\system\. It can also contain an empty string or NULL. If this value is an empty string or NULL, all Recycle Bins on all drives will be emptied.</param>
        /// <param name="dwFlags">SHERB</param>
        /// <returns>If this function succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
        [DllImport("shell32.dll")]
        private static extern int SHEmptyRecycleBin(IntPtr hwnd, string pszRootPath, SHERB dwFlags);

 public enum SHERB:int
    { 
        /// <summary>
        /// No dialog box confirming the deletion of the objects will be displayed.
        /// </summary>
        SHERB_NOCONFIRMATION =1,
        /// <summary>
        /// No dialog box indicating the progress will be displayed.
        /// </summary>
        SHERB_NOPROGRESSUI=2,
        /// <summary>
        /// No sound will be played when the operation is complete.
        /// </summary>
        SHERB_NOSOUND =4 
    }