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How to get handle to a TextBox control inside window in Window 10

I am working on automation to Windows 10 with C#.
One of the tasks is to write data to a TextBox in window called "Add exclusion".
In order to enter this window:
Open Settings => Update & security => Windows Defender => Add an exclution => Exclude a file extension
I understood that I need to use SendMessage(...) or SetWindowText(...) functions for writing data to a control.
But I need to pass these functions a handle of the control I want to write to.
So I need to use GetDlgItem(hDlg, nIDDlgItem).
The parameter nIDDlgItem is the control ID but I am not able to find the control ID of the TextBox control in the "Add exclusion" window.
I used Spy++ but when I put the target icon I received only "Shell_Dialog" class:
I have only the window handle:
I need the handle of the TextBox control.
EDIT (20.6.2016):
I tried to use the Inspect.exe tool from Windows 10 Kit but when I am placing the curoser on the TextBox control it writes me "Access is denied":
References:
SetText of textbox in external app. Win32 API
Inspect (Inspect.exe) is a Windows-based tool that enables you select any UI element

Third alternative is to select parent (ie. dialog window) for your button (ie. it will be of Dialog class), and register for WM_COMMAND messages from it. Then after pressing it you button ID will be displayed as wID: XX in message window.
Source: Using visual studio's spy++ tool:

In order to be able to do it I needed to use the Inspect.exe tool with administrator permissions.
Thanks #NineBerry,
After I opened the Inspect.exe as administrator I could see all the details.

Find and Close a Dialog in Firefox using Selenium and C#

Issue: My selenium script is not recognizing and closing a dialog box that pops up when I redirect to a URl that contains file to download. The attached image shows the dialog I am referring to.
I know this has been asked a million times and I have spent at least 24 hours researching and trying other suggestions posted across the web but with no success. I am hoping the attached image will clarify which Firefox dialog box I am referring too.
I have tried the following solutions
1. Creating IAlerts (Alert element is not found)
2. Searching by trying to find the element by xpath (xpath to cancel was not found)
3. WindowsHandler Method (was not able to figure out the window name)
Any help on this would be greatly appreciated. Thank You in advance!
FireFox Dialog

There are several types of "popups".
Javascript dialogs - These are NOT HTML dialogs but are instead Javascript created dialogs. These consist of alert(), confirm(), and prompt() and can be handled with Alert.
HTML dialogs - These take on various forms depending on how they are formatted. If you right-click on the dialog and see the typical context menu for your browser, then it's an HTML dialog. They are part of the DOM of the current page so you can use Selenium to access this just as you would any other page (e.g., no window handles needed).
Browser window - These are actually another browser window that pops up and may look like a dialog, depending on how it's formatted. It's different than an HTML dialog because it can be moved outside of the current browser page frame. You will need to use window handles to access these windows as you would another tab in the browser. Once you get ahold of the window handle, you can access the HTML of the page like any other page.
Browser dialog - these take on various forms but are akin to System dialogs. They are not made up of HTML so they cannot be accessed by Selenium. Other than using a library to access them, you can interact with them in a limited fashion by sending keys such as <SPACE>, <TAB>, <ENTER>, etc.
What you have pictured is a (4) browser dialog. They it takes on different forms depending on the browser you do the action on. Your best course of action is probably send keys. Sometimes, depending on the browser, you can specify settings to autodownload a file to a specific location so that the dialog doesn't come up. I've never used this so I can't direct you there.

I was able to find and close a download dialog box by checking the amount of open windows after the dialog appears. This solution worked for me.
Find a link to open a dialog and click it:
var link = MyBrowser.Driver.FindElement(OpenQA.Selenium.By.Id("Button"));
IJavaScriptExecutor js = driver as IJavaScriptExecutor;
js.ExecuteScript("arguments[0].click();", link);
Get the new window count after the dialog opens:
var newWindowCount = MyBrowser.Driver.WindowHandles.Count;
Switch to the newly opened dialog and close it:
MyBrowser.Driver.SwitchTo().Window(MyBrowser.Driver.WindowHandles[newWindowCount-1]);
MyBrowser.Driver.Close();

Not able to open second page of my wpf browser application in a new browser window?

I am new to wpf.I am doing a browser application in wpf and i wanted to know if i can open my second page in a new browser window.
I am able to open a new browser window using system windows diagnostics.process statement and i am able to load my project also but not the desired page in it.
I am also able to open my desired page like a aplication using uri.
But what i want is a hybrid of both and i am not able to find anything to suit my purpose.
Thanks in advance mates

you can use this code
1. Add a new window NewWindow
2. var newWindow= new NewWindow();
newWindow.Show(); // works
//Or use ShowDialog, if parant wait close of child window
newWindow.ShowDialog();

Watin : Open Windows form in watin

i have a link that when we click will produce a windows form that prompt us to download.Is there a way using watin for us to attach to this form and click the button?Can someone please direct me to the correct way?

What do you mean by saying, that clicking a linkd produces a windows form? Isn't it just a separate IE window, probably created by js window.open? If so, then you need to create separate WatiN IE instance by attaching to that window. For example, if you want to control internet explorer window with title "My popup", you can do it that way:
var popup = IE.AttachTo<IE>(Find.ByTitle("My popup"))
You can find IE windows using constraints created using: Find.ByUrl, Find.ByUri, Find.By("hwnd", windowHandle) and mentioned Find.ByTitle.

WinForms Web Browser control forcing refocus?

I'm trying to automate a web process where I need to click a button repeatedly. When my code "clicks" that button (an HtmlElement obtained from the WebBrowser control I have on my form) then it brings focus back to my application, more specifically the WebBrowser control. I wish to better automate this process so that the user can do other things while the process is going on, but that can't happen if the window is unminimizing itself because it's attaining focus.
The code associated with the clicking is:
HtmlElement button = Recruiter.Document.GetElementById("recruit_link");
button.InvokeMember("click");
I've also tried button.RaiseEvent("onclick") and am getting the exact same results, with focus problems and all.
I've also tried hiding the form, but when the InvokeMember/RaiseEvent method is called, whatever I was working on loses focus but since the form is not visible then the focus seems to go nowhere.
The only non-default thing about the webbrowser is it's URI being set to my page and ScriptErrorsSuppressed being set to True.

Why do You need to click this button? It's sending some form?
If yes, you can use WebClient and simulate sending form without graphic interface.
Basicly almost anything significant requires connection to website using Get Post or multipart/post so WebClient will be perfect. You can simply get the site wich is this button on and parse it to get what clicking it do. And then simulate your own action.

In IE7 or higher you can implement IProtectFocus on the webbrowser site and deny the focus change. You would be much better off if you use the raw ActiveX or its wrappers that support this kind of customization, e.g. csexwb. If you have to use the winform webbrowser control, you need to create your own webbrowser site.