File scoped namespaces (#1700)

<!--- Provide a general summary of your changes in the Title above -->

## Description
<!--- Describe your changes in detail -->
This PR will switch C# files from block-scoped namespaces to file-scoped
namespaces.
Closes #1689.

## Motivation and Context
<!--- Why is this change required? What problem does it solve? -->
<!--- If it fixes an open issue, please link to the issue here. -->
Improves readability.

## How Has This Been Tested?
<!--- Please describe in detail how you tested your changes. -->
<!--- Include details of your testing environment, and the tests you ran
to -->
<!--- see how your change affects other areas of the code, etc. -->
- Confirmed that all unit tests passes.
- Run the app and navigated through all pages.

## Screenshots (if appropriate):

## Types of changes
<!--- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)

UITests/AxeHelper.cs

@@ -20,43 +20,42 @@
 using System.Diagnostics;
 using System.Linq;
 
-namespace UITests
+namespace UITests;
+
+public class AxeHelper
 {
-	public class AxeHelper
+	public static IScanner AccessibilityScanner;
+
+	internal static void InitializeAxe()
 	{
-		public static IScanner AccessibilityScanner;
+		var processes = Process.GetProcessesByName("WinUIGallery");
+		Assert.IsTrue(processes.Length > 0);
 
-		internal static void InitializeAxe()
-		{
-			var processes = Process.GetProcessesByName("WinUIGallery");
-			Assert.IsTrue(processes.Length > 0);
+		var config = Config.Builder.ForProcessId(processes[0].Id).Build();
 
-			var config = Config.Builder.ForProcessId(processes[0].Id).Build();
+		AccessibilityScanner = ScannerFactory.CreateScanner(config);
+	}
 
-			AccessibilityScanner = ScannerFactory.CreateScanner(config);
-		}
+	public static void AssertNoAccessibilityErrors()
+	{
+	// Bug 1474: Disabling Rules NameReasonableLength and BoundingRectangleNotNull temporarily
+	var testResult = AccessibilityScanner.Scan(null).WindowScanOutputs.SelectMany(output => output.Errors)
+			.Where(rule => rule.Rule.ID != RuleId.NameIsInformative)
+			.Where(rule => rule.Rule.ID != RuleId.NameExcludesControlType)
+			.Where(rule => rule.Rule.ID != RuleId.NameExcludesLocalizedControlType)
+			.Where(rule => rule.Rule.ID != RuleId.SiblingUniqueAndFocusable)
+			.Where(rule => rule.Rule.ID != RuleId.NameReasonableLength)
+			.Where(rule => rule.Rule.ID != RuleId.BoundingRectangleNotNull)
+			.Where(rule => rule.Rule.ID != RuleId.BoundingRectangleNotNullListViewXAML)
+			.Where(rule => rule.Rule.ID != RuleId.BoundingRectangleNotNullTextBlockXAML)
+			.Where(rule => rule.Rule.ID != RuleId.NameNotNull)
+			.Where(rule => rule.Rule.ID != RuleId.ChromiumComponentsShouldUseWebScanner);
 
-		public static void AssertNoAccessibilityErrors()
+	if (testResult.Any())
 		{
-            // Bug 1474: Disabling Rules NameReasonableLength and BoundingRectangleNotNull temporarily
-            var testResult = AccessibilityScanner.Scan(null).WindowScanOutputs.SelectMany(output => output.Errors)
-				.Where(rule => rule.Rule.ID != RuleId.NameIsInformative)
-				.Where(rule => rule.Rule.ID != RuleId.NameExcludesControlType)
-				.Where(rule => rule.Rule.ID != RuleId.NameExcludesLocalizedControlType)
-				.Where(rule => rule.Rule.ID != RuleId.SiblingUniqueAndFocusable)
-				.Where(rule => rule.Rule.ID != RuleId.NameReasonableLength)
-				.Where(rule => rule.Rule.ID != RuleId.BoundingRectangleNotNull)
-				.Where(rule => rule.Rule.ID != RuleId.BoundingRectangleNotNullListViewXAML)
-				.Where(rule => rule.Rule.ID != RuleId.BoundingRectangleNotNullTextBlockXAML)
-				.Where(rule => rule.Rule.ID != RuleId.NameNotNull)
-				.Where(rule => rule.Rule.ID != RuleId.ChromiumComponentsShouldUseWebScanner);
-
-            if (testResult.Any())
-			{
-				var mappedResult = testResult.Select(result =>
-				"Element " + result.Element.Properties["ControlType"] + " violated rule '" + result.Rule.Description + "'.");
-				Assert.Fail("Failed with the following accessibility errors \r\n" + string.Join("\r\n", mappedResult));
-			}
+			var mappedResult = testResult.Select(result =>
+			"Element " + result.Element.Properties["ControlType"] + " violated rule '" + result.Rule.Description + "'.");
+			Assert.Fail("Failed with the following accessibility errors \r\n" + string.Join("\r\n", mappedResult));
 		}
 	}
-}
+}

UITests/SampleTestTemplate.cs

@@ -18,24 +18,22 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using OpenQA.Selenium.Appium.Windows;
 
-namespace UITests
+namespace UITests;
+
+[TestClass]
+public class SampleTestTemplate : TestBase
 {
-	[TestClass]
-	public class SampleTestTemplate : TestBase
-	{
 
-		private static WindowsElement element1 = null;
-		private static WindowsElement element2 = null;
+	private static WindowsElement element1 = null;
+	private static WindowsElement element2 = null;
 
-		public static void ClassInitialize(TestContext context)
-		{
-			OpenControlPage("MyControlPage");
-			Thread.Sleep(1000);
-			element1 = Session.FindElementByAccessibilityId("Element Locator");
-			Assert.IsNotNull(element1);
-			element2 = Session.FindElementByAccessibilityId("Element Locator");
-			Assert.IsNotNull(element2);
-		}
+	public static void ClassInitialize(TestContext context)
+	{
+		OpenControlPage("MyControlPage");
+		Thread.Sleep(1000);
+		element1 = Session.FindElementByAccessibilityId("Element Locator");
+		Assert.IsNotNull(element1);
+		element2 = Session.FindElementByAccessibilityId("Element Locator");
+		Assert.IsNotNull(element2);
 	}
 }
-