using mshtml how to use oncontextmenu inC#

[nilwarude85]

private HTMLDocumentEve nts2_Event _docEvent;
private mshtml.HTMLDocu ment doc = null;
// private string _content = string.empty;

void gmailurl_Docume ntComplete(obje ct pDisp, ref object URL)
{
//doc = null;
//mshtml.IHTMLDoc ument2 doc = (IHTMLDocument2 )gmailurl.Docum ent;

//mshtml.HTMLDocu mentEvents2_Eve nt iEvent = (mshtml.HTMLDoc umentEvents2_Ev ent)doc;
//iEvent.oncontex tmenu += new HTMLDocumentEve nts2_oncontextm enuEventHandler (ClickEventHand ler);
//foreach (IHTMLElement link1 in doc.all)
//{
// HTMLButtonEleme nt el = link1 as HTMLButtonEleme nt;


//}
//foreach (IHTMLElement l in doc.all)
//{


//}

//foreach (HtmlElement element in doc.all)
//{
// HTMLButtonEleme nt btn = lk as HTMLButtonEleme nt;


//}
//foreach (IHTMLElement link in doc.links)
//{
// // HtmlElement ele=link.

// HTMLAnchorEleme nt anchor = link as HTMLAnchorEleme nt;
// if (anchor != null)
// {
// HTMLAnchorEvent s_Event handler = anchor as HTMLAnchorEvent s_Event;
// if (handler != null)
// {
// handler.onconte xtmenu += new HTMLAnchorEvent s_oncontextmenu EventHandler(de legate()
// {
// MessageBox.Show ("You clicks the link: " + anchor.href);
// return true;
// });

// }
// }
//}

//_docEvent = (HTMLDocumentEv ents2_Event)gma ilurl.Document;
//_docEvent.oncon textmenu += new HTMLDocumentEve nts2_oncontextm enuEventHandler (_docEvent_onco ntextmenu);

//if (gmailurl.Docum ent != null)
//{
// _docEvent = (HTMLDocumentEv ents2_Event)gma ilurl.Document;
// _docEvent.oncon textmenu += new HTMLDocumentEve nts2_oncontextm enuEventHandler (_docEvent_onco ntextmenu);
//}
if (doc == null)
{
doc = (mshtml.HTMLDoc ument)gmailurl. Document;

mshtml.HTMLDocu mentEvents2_Eve nt iEvent = (mshtml.HTMLDoc umentEvents2_Ev ent)doc;
// iEvent.onkeydow n += new mshtml.HTMLDocu mentEvents2_onk eydownEventHand ler(keyDown);
iEvent.oncontex tmenu += new HTMLDocumentEve nts2_oncontextm enuEventHandler (ClickEventHand ler);
doc.focus();
}

above code is working but textbox is disabled so give me appropriate answer