How to handle File download dialog/popup in IE browser USING SELENIUM and C#

Question

I have page which downloads a file which shows a dialog on the bottom with OPEN SAVE CANCEL options, how can I click those options ? I am using IE browser, I saw some solutions using third party AutoIt, Robot class, but I am looking with Selenium and C# only. Attached is the image of what I am talking.. Any idea how can we do this ?

Answer 1

 AutoItX3 autoit = new AutoItX3();
                autoit.WinActivate("Save");            
                Thread.Sleep(1000);
                autoit.Send("{F6}");
                Thread.Sleep(1000);
                autoit.Send("{TAB}");
                Thread.Sleep(1000);
                autoit.Send("{ENTER}");