P/Invoke Objectarx command

Dear All,

Please Help.

I have a problem with DCL dialogs not removing themselves after they have

been closed until the lisp function is actually finished. I found a way in ARX but not in .NET.

Can anyone please guide me to invoke these lines in c#.net using P/Invoke method.

acedGetAcadDwgView()->InvalidateRect(NULL, TRUE);
acedGetAcadDwgView()->UpdateWindow();

& also

acedGetAcadFrame()->InvalidateRect(NULL, TRUE);
acedGetAcadFrame()->UpdateWindow();

Even if any one at least point me How can it be done in .net (just to get me started), it would be highly appreciable.

Thanks in Advance.