C#

using System.Runtime.InteropServices;
using Microsoft.Win32;

[StructLayout(LayoutKind.Sequential)]
  private struct UUID
  {
      public int Data1;
      public short Data2;
      public short Data3;
      public byte[] Data4;
  }

  /// <summary>
  /// The structure that contains statistics about a URL. 
  /// </summary>
  [StructLayout(LayoutKind.Sequential)]
  private struct STATURL
  {
      /// <summary>
      /// Struct size
      /// </summary>
      public int cbSize;
      /// <summary>
      /// URL
      /// </summary>                                                                   
      [MarshalAs(UnmanagedType.LPWStr)]
      public string pwcsUrl;
      /// <summary>
      /// Page title
      /// </summary>
      [MarshalAs(UnmanagedType.LPWStr)]
      public string pwcsTitle;
      /// <summary>
      /// Last visited date (UTC)
      /// </summary>
      public System.Runtime.InteropServices.ComTypes.FILETIME ftLastVisited;
      /// <summary>
      /// Last updated date (UTC)
      /// </summary>
      public System.Runtime.InteropServices.ComTypes.FILETIME ftLastUpdated;
      /// <summary>
      /// The expiry date of the Web page's content (UTC)
      /// </summary>
      public System.Runtime.InteropServices.ComTypes.FILETIME ftExpires;
      /// <summary>
      /// Flags. STATURLFLAGS Enumaration.
      /// </summary>
      public uint dwFlags;
  }

  //Enumerates the cached URLs
  [ComImport]
  [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
  [Guid("3C374A42-BAE4-11CF-BF7D-00AA006946EE")]
  private interface IEnumSTATURL
  {
      void Next(int celt, ref STATURL rgelt, out int pceltFetched);	//Returns the next \"celt\" URLS from the cache
      void Skip(int celt);	//Skips the next \"celt\" URLS from the cache. doed not work.
      void Reset();	//Resets the enumeration
      void Clone(out IEnumSTATURL ppenum);	//Clones this object
      void SetFilter([MarshalAs(UnmanagedType.LPWStr)] string poszFilter, uint dwFlags);	//Sets the enumeration filter
  }

  [ComImport]
  [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
  [Guid("3C374A41-BAE4-11CF-BF7D-00AA006946EE")]
  private interface IUrlHistoryStg
  {
      void AddUrl(string pocsUrl, string pocsTitle, uint dwFlags);	//Adds a new history entry
      void DeleteUrl(string pocsUrl, int dwFlags);	//Deletes an entry by its URL. does not work!
      void QueryUrl([MarshalAs(UnmanagedType.LPWStr)] string pocsUrl, uint dwFlags, ref string lpSTATURL);	//Returns a STATURL for a given URL
      void BindToObject([In] string pocsUrl, [In] UUID riid, IntPtr ppvOut); //Binds to an object. does not work!
      object EnumUrls { [return: MarshalAs(UnmanagedType.IUnknown)] get;}	//Returns an enumerator for URLs
  }

  [ComImport]
  [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
  [Guid("AFA0DC11-C313-11D0-831A-00C04FD5AE38")]
  private interface IUrlHistoryStg2 : IUrlHistoryStg
  {
      new void AddUrl(string pocsUrl, string pocsTitle, uint dwFlags);	//Adds a new history entry
      new void DeleteUrl(string pocsUrl, int dwFlags);	//Deletes an entry by its URL. does not work!
      void QueryUrl([MarshalAs(UnmanagedType.LPWStr)] string pocsUrl, uint dwFlags, ref STATURL lpSTATURL);	//Returns a STATURL for a given URL
      new void BindToObject([In] string pocsUrl, [In] UUID riid, IntPtr ppvOut);	//Binds to an object. does not work!
      new object EnumUrls { [return: MarshalAs(UnmanagedType.IUnknown)] get;}	//Returns an enumerator for URLs
   
      void AddUrlAndNotify(string pocsUrl, string pocsTitle, int dwFlags, int fWriteHistory, object poctNotify, object punkISFolder);//does not work!
      void ClearHistory();	//Removes all history items
  }

  //UrlHistory class
  [ComImport]
  [Guid("3C374A40-BAE4-11CF-BF7D-00AA006946EE")]
  private class UrlHistoryClass { }

  /// <summary>
  /// Clears the IE history of the current user.
  /// </summary>
  public static void ClearHistory()
  {
      UrlHistoryClass c = new UrlHistoryClass();
      ((IUrlHistoryStg2)c).ClearHistory();
  }

using System.Runtime.InteropServices;

...

[DllImport("shell32.dll")]
static extern void SHAddToRecentDocs(ShellAddToRecentDocsFlags flag, IntPtr pidl);

[Flags]
private enum ShellAddToRecentDocsFlags : uint
{
   Pidl = 0x001,
   Path = 0x002,
}

/// <summary>
/// Clears the recent documents list for the current user.
/// </summary>
public static void ClearRecentDocs()
{
   SHAddToRecentDocs(ShellAddToRecentDocsFlags.Pidl, IntPtr.Zero);
}

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