Fix typos

DotNet/Xamarin/App.xaml.md

@@ -13,7 +13,7 @@ The word *winfx* refers to a name once used for the .NET Framework 3.0, which in
 The `x:Class` attribute can appear only on the root element of a XAML file. It specifies the .NET namespace and name of a derived class. The base class of this derived class is the root element.
 
 In other words, this `x:Class` specification indicates that the `App` class in the `AppName` namespace derives from `Application`.
-That’s exactly the same information as the `App` class definition in the `App.xaml.cs` file.
+That's exactly the same information as the `App` class definition in the `App.xaml.cs` file.
 
 ```xml
 <?xml version="1.0" encoding="utf-8" ?>
@@ -31,7 +31,7 @@ That’s exactly the same information as the `App` class definition in the `App.
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              x:Class="AppName.App">
 
-    <!-- collection of shared resources definiions -->
+    <!-- collection of shared resources definitions -->
     <Application.Resources>
 
         <!-- Application resource dictionary -->
@@ -42,7 +42,7 @@ That’s exactly the same information as the `App` class definition in the `App.
 
         <!-- define a reusable style -->
         <Style x:Key="Style Name" TargetType="Element Type">
-            <!-- set poperties of the style -->
+            <!-- set properties of the style -->
             <Setter Property="PropertyName" Value="PropertyValue">
         </Style>
 

DotNet/Xamarin/Page.xaml.md

@@ -52,7 +52,7 @@ The term *view* in Xamarin.Forms denotes familiar types of presentation and inte
 
 - StackLayout: Organizes views linearly, either horizontally or vertically.
 - AbsoluteLayout: Organizes views by setting coordinates & size in terms of absolute values or ratios.
-- RelativeLayout: Organizes views by setting constraints relative to their parent’s dimensions & position.
+- RelativeLayout: Organizes views by setting constraints relative to their parent's dimensions & position.
 - Grid: Organizes views in a grid of Rows and Columns
 - FlexLayout: Organizes views horizontally or vertically with wrapping.
 - ScrollView: Layout that's capable of scrolling its content.
@@ -60,7 +60,7 @@ The term *view* in Xamarin.Forms denotes familiar types of presentation and inte
 ### Grid Layout
 
 ```xml
-<!-- "<num>*" makes the dimesions proportional -->
+<!-- "<num>*" makes the dimensions proportional -->
 <Gird.RowDefinitions>
     <!-- insert a row in the layout -->
     <RowDefinition Height="2*"/>
@@ -76,11 +76,11 @@ The term *view* in Xamarin.Forms denotes familiar types of presentation and inte
 
 ```xml
 <Image Source="" BackgroundColor="" [LayoutPosition]/>
-<!-- source contains reference to imagefile in Xamarin.[OS]/Resources/drawable -->
+<!-- source contains reference to image file in Xamarin.[OS]/Resources/drawable -->
 
 <!-- box to insert text -->
 <Editor Placeholder="placeholder text" [LayoutPosition]/>
 
 <!-- clickable button -->
-<Button Text="button text" BackgroundColor="" Clicked="function_to_call" [LayoytPosition]/>
+<Button Text="button text" BackgroundColor="" Clicked="function_to_call" [LayoutPosition]/>
 ```

DotNet/Xamarin/ViewModel.cs.md

@@ -27,7 +27,7 @@ namespace AppName.ViewModels
                 field = value;
 
                 var args = new PropertyChangedEventArgs(nameof(Property));  // EVENT: let view know that the Property has changed
-                PropertyChanged?.Invoke(this, args);  // Ivoke event to notify the view
+                PropertyChanged?.Invoke(this, args);  // Invoke event to notify the view
             }
         }
     }