C#

public int SetSite(object site)
        {
            SHDocVw.IWebBrowser2 m_pIWebBrowser2 = site as SHDocVw.IWebBrowser2;
            IServiceProvider ISP = site as IServiceProvider;

            if (m_pIWebBrowser2 != null)
            {
                Marshal.ReleaseComObject(m_pIWebBrowser2);
                m_pIWebBrowser2 = null;
            }

            if (Explorer != null)
            {
                Marshal.ReleaseComObject(Explorer);
                Explorer = null;
            }

            if (ISP != null)
            {
                Guid IID_IUnknown = new
                Guid("{00000000-0000-0000-C000-000000000046}");
                Guid IID_IWebBrowserApp = new
                Guid("{0002DF05-0000-0000-C000-00000000046}");
                object pOut;

                try
                {
                    ISP.QueryService(ref IID_IWebBrowserApp, ref IID_IUnknown, out
                    pOut);
                    Explorer = (WebBrowserClass)Marshal.CreateWrapperOfType(pOut as
                    IWebBrowser2, typeof(WebBrowserClass));
                }
                catch (Exception e)
                {
                    System.Windows.Forms.MessageBox.Show(e.Message, "Talkative Browser");
                }
            }

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct OLECMDTEXT
    {
        public uint cmdtextf;
        public uint cwActual;
        public uint cwBuf;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 100)]
        public char rgwz;
    }


    [StructLayout(LayoutKind.Sequential)]
    public struct OLECMD
    {
        public uint cmdID;
        public uint cmdf;
    }


    [ComImport,
    Guid("b722bccb-4e68-101b-a2bc-00aa00404770"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOleCommandTarget
    {
        void QueryStatus(ref Guid pguidCmdGroup, UInt32 cCmds,
        [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] OLECMD[] prgCmds, ref 
        OLECMDTEXT CmdText);
        void Exec(ref Guid pguidCmdGroup, uint nCmdId, uint nCmdExecOpt, ref object
        pvaIn, ref object pvaOut);
    }

try
     {
        using (StreamWriter writer = File.CreateText(path))
        {
            foreach (string line in rich.Lines)
                   writer.WriteLine(line);
        }
     }
     catch (IOException e)
     {
         // error handling here
     }