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How to set the download folder for Edge in Selenium?

I am writing automated tests using Selenium. I want to set the download directory in Edge so that I can download files as part of my test. There is an EdgeOptions object that I can provide when creating the EdgeDriver, but I don't know what to set on the EdgeOptions.
I know the equivalent of how to do this in Chrome
chromeOptions.AddUserProfilePreference("download.default_directory", #"C:\temp")
and Firefox
firefoxOptions.SetPreference("browser.download.dir", #"C:\temp")
But, how do I do the same thing in Edge? And get it to download automatically without a save prompt?

As #Prany already mentioned, probably there is no way to set download automatically. And if I right understood, you want to handle with native window dialogue, when you are clicking on download button. Selenium cannot interact with native windows, but you can use this framework. The sample code would be like this:
// Press the A Key Down
KeyboardSimulator.KeyDown(Keys.A);
// Let the A Key back up
KeyboardSimulator.KeyUp(Keys.A);
// Press A down, and let up (same as two above)
KeyboardSimulator.KeyPress(Keys.A);
// Simulate (Ctrl + C) shortcut, which is copy for most applications
KeyboardSimulator.SimulateStandardShortcut(StandardShortcut.Copy);
// This does the same as above
KeyboardSimulator.KeyDown(Keys.Control);
KeyboardSimulator.KeyPress(Keys.C);
KeyboardSimulator.KeyUp(Keys.Control);
So you can simulate Ctrl + V keyboard action and Enter action. Hope it helps.

You can do this for Edge like this:
// hide driver Console? true/false
EdgeDriverService service = EdgeDriverService.CreateDefaultService();
service.HideCommandPromptWindow = true; // hide Console
// change Standard-Download-Path
EdgeOptions options = new EdgeOptions();
var downloadDirectory = "C:\temp";
// Setting custom download directory
options.AddUserProfilePreference("download.default_directory", downloadDirectory);
// start Selenium Driver:
webdriver = new EdgeDriver(service, options);
// max. Window
webdriver.Manage().Window.Maximize();

WatiN doesn't find anything

I'm new to C# and I'm trying to do an application that automatize Internet Explorer.
When I click a button, the application does :
using ( var Browser = new IE())
{
Browser.GoTo("http://testweb.com");
Browser.TextField(Find.ByName("username")).TypeText("User");
Browser.TextField(Find.ByName("password")).TypeText("Pass");
}
But it doesn't write anything. It navigates to the web but...

Try this:
IE ie = null;
ie = new IE();
ie.GoTo("Link");
ie.WaitForComplete();
At least to get started.
For the other bit, you need to get an exact identification and then you can tell WaTiN to interact with it.
Textfield userTextBox = ie.Textfield(Find.ByName("name"));
userTextBox.TypeText("user");
This may seem banal but now you can add a peek definition in your code and see if "userTextBox" gets found by name. If it doesn't you need to find it through another method (ID or class).

disable IE visibility while using WatiN

I use watin, because I need to open some websites in the background for which the user needs to support Javascript. I don't know if WatiN is the best for this job, but at the moment it takes very long until Internet Explorer gets visible. I need to disable to popping up of Internet Explorer while using WatiN. User doesn't need to see the opening of sites. Is it possible while using WatiN to visit a website without showing it the user or should I use another alternative which supports JS on client side?
My code at the moment;
public static void visitURL()
{
IE iehandler = new IE("http://www.isjavascriptenabled.com");
if (iehandler.ContainsText("Yes"))
Console.WriteLine("js on");
else
Console.WriteLine("js off");
}

The WatIn.Core.IE class has a Visible property, you can initialize the object like that:
new WatiN.Core.IE() { Visible = true }
This way the IE will just blink on the screen when it's created, and then it will get hidden. You can later control the visibility of the IE with the ShowWindow method of WatiN.Core.IE class - I mean you can show it on the screen if you need, or you can hide again.

I use exactly that trick (of hiding IE) for writing UnitTests (using https://github.com/o2platform/FluentSharp_Fork.WatiN) that run in an hidden IE window
For example here is how I create a helper class (with an configurable hidden value)
public IE_TeamMentor(string webRoot, string path_XmlLibraries, Uri siteUri, bool startHidden)
{
this.ie = "Test_IE_TeamMentor".popupWindow(1000,700,startHidden).add_IE();
this.path_XmlLibraries = path_XmlLibraries;
this.webRoot = webRoot;
this.siteUri = siteUri;
}
which is then consumed by this test:
[Test] public void View_Markdown_Article__Edit__Save()
{
var article = tmProxy.editor_Assert() // assert the editor user (or the calls below will fail due to security demands)
.library_New_Article_New() // create new article
.assert_Not_Null();
var ieTeamMentor = this.new_IE_TeamMentor_Hidden();
var ie = ieTeamMentor.ie;
ieTeamMentor.login_Default_Admin_Account("/article/{0}".format(article.Metadata.Id)); // Login as admin and redirect to article page
var original_Content = ie.element("guidanceItem").innerText().assert_Not_Null(); // get reference to current content
ie.assert_Has_Link("Markdown Editor")
.link ("Markdown Editor").click(); // open markdown editor page
ie.wait_For_Element_InnerHtml("Content").assert_Not_Null()
.element ("Content").innerHtml()
.assert_Is(original_Content); // confirm content matches what was on the view page
var new_Content = "This is the new content of this article".add_5_RandomLetters(); // new 'test content'
ie.element("Content").to_Field().value(new_Content); // put new content in markdown editor
ie.button("Save").click(); // save
ie.wait_For_Element_InnerHtml("guidanceItem").assert_Not_Null()
.element ("guidanceItem").innerHtml()
.assert_Is("<P>{0}</P>".format(new_Content)); // confirm that 'test content' was saved ok (and was markdown transformed)
ieTeamMentor.close();
}
Here are a number of posts that might help you to understand how I use it:
https://github.com/TeamMentor/Dev/tree/master/Source_Code/TM_UnitTests/TeamMentor.UnitTests.QA/TeamMentor_QA_IE
http://blog.diniscruz.com/2014/07/how-to-debug-cassini-hosted-website-and.html
http://blog.diniscruz.com/2014/07/using-watin-and-embedded-cassini-to-run.html
http://blog.diniscruz.com/search/label/WatiN

How to handle multiple tabs in internet explorer with the IWebBrowserApp com interface?

I am using the following code (C#) based on the IWebBrowserApp com interface to find the Internet explorer window that matches the page I am trying to find, based on the title of the page.
I works fine if the page is on the first tab, but it does not work if its a later tab. So how do I get access to the tabs in internet explorer?
objSW = new ShellWindows();
IEnumerator ie = objSW.GetEnumerator();
while (ie.MoveNext())
{
obj = ie.Current;
app = (IWebBrowserApp)ie.Current;
System.Object docObj = app.Document;
HTMLDocumentClass hdoc = (HTMLDocumentClass)docObj;
if (hdoc.title.Contains(title)) matches.Add(app.HWND, app);
//do something
}

Sorry, but there's no supported API for tab enumeration/manipulation in IE9 or earlier.

How can I send input to Visual Studio using Windows API

I am trying to develop a util (using system-hook) for that works like an expander (user selects some text and presses a hotkey and it is expands). It should work with Visual Studio.
I want to implement this using Windows API because I want to develop an app that works globally with any application (whether you're using VS, or wordpad, you should get the same functionality).
I've been able to do this successfully with notepad, wordpad, etc. using EM_ GETSEL and EM_REPLACESEL messages. But these APIs are not working with Visual Studio, or ms word.
What APIs should I use to be able to
1. Detect what text is selected.
2. Send input to the editor.
I am programming in C#. If you must know what I am trying to do... I am trying to make a universal port of ZenCoding that works on any editor. So all help will be appreciated.

For part 2 you could try using Windows Input Simulator which is an open source project I've just released to Codeplex to wrap the Win32 SendInput. Instead of SendKeys which just simulates text input, you can actually simulate real key strokes and complex chords to the active window.
In your case, if the user can perform the task with the Keyboard, this project will help you, otherwise you'd need to find another solution.
Hope this helps.

Why don't you use a System.Windows.Forms.SendKeys class for simulating keyboard input from user?
You can use:
SendKeys.SendWait("^C"); //CTRL+C
var selectedText = Clipboard.GetText();
var newText = Replace(selectedText);
SendKEys.SendWait("^V"); //CTRL+V

You can use WPF's Automation functionality, encapsulated in these two namespaces:
System.Windows.Automation
System.Windows.Automation.Provider
As an example, this is a method for finding an automation target element (e.g. a typical win control):
public static AutomationElement FindElement(AutomationElement context, PropertyCondition[] conditions)
{
// if no conditions, there's no search to do: just return the context, will be used as target
if (conditions == null)
{
return (context);
}
// create the condition to find
System.Windows.Automation.Condition condition = null;
if (conditions.Length <= 0)
{
throw (new ArgumentException("No conditions specified"));
}
else if (conditions.Length == 1)
{
condition = conditions[0];
}
else
{
AndCondition ac = new AndCondition(conditions);
condition = ac;
}
// find the element
CacheRequest creq = new CacheRequest();
creq.TreeFilter = Automation.ControlViewCondition;
using (creq.Activate())
{
AutomationElement e = AutomationContext(context);
AutomationElement target = e.FindFirst(TreeScope.Subtree, condition);
return (target);
}
}

Whatever you try, be absolutely sure to try it, ASAP, with Visual Studio 2010 beta 2. The editor has largely been rewritten, and hacks that work with an earlier version should be tested again.