fix lecture 12-15

12-files-and-streams.md

@@ -217,15 +217,15 @@ The following reads the first 20 characters of a file and prints them to the con
 
 ```csharp
 string path = @"C:\Users\Public\TestFolder\TestFile.txt";
-int nOfBytesToPrint = 20;
-byte[] byteArray = new byte[nOfBytesToPrint];
+int numberOfBytesToPrint = 20;
+byte[] byteArray = new byte[numberOfBytesToPrint];
 
 if (!File.Exists(path))
   Console.WriteLine($"The file {path} does not exist.");
 else
   using (FileStream fs = File.OpenRead(path))
   {
-    fs.Read(byteArray, 0, nOfBytesToPrint);
+    fs.Read(byteArray, 0, numberOfBytesToPrint);
   };
 // No need to close the file since it was handled inside of a using block
 

13-generics-ienumerable-and-linq.md

@@ -47,32 +47,30 @@ class Program
 
 ### Multiple type parameters
 
-Generic classes can receive multiple types as parameters:
-
-```csharp
-class CustomContainer<T1, T2, T3>
-{
-  public T1 First { get; set; }
-  public T2 Second { get; set; }
-  public T3 Third { get; set; }
-}
-class Program
-{
-  static void Main(string[] args)
+* Generic classes can receive multiple types as parameters:
+  ```csharp
+  class CustomContainer<T1, T2, T3>
   {
-    CustomContainer<int, string, DateTime> container
-      = new CustomContainer<int, string, DateTime>();
-    container.First = 10;
-    container.Second = "Testing.";
-    container.Third = DateTime.Now;
+    public T1 First { get; set; }
+    public T2 Second { get; set; }
+    public T3 Third { get; set; }
   }
-}
-```
+  class Program
+  {
+    static void Main(string[] args)
+    {
+      CustomContainer<int, string, DateTime> container
+        = new CustomContainer<int, string, DateTime>();
+      container.First = 10;
+      container.Second = "Testing.";
+      container.Third = DateTime.Now;
+    }
+  }
+  ```
 
 ### Creating a generic Method
 
 ```csharp
-
 void GenericMethodExample<T>(T value)
 {
   Console.WriteLine
@@ -83,7 +81,7 @@ GenericMethodExample<string>("ABC");
 
 ![](imgs/13%20Generics%2C%20IEnumerable%20and%20LINQ_2.png)
 
-* ***Note:*** You could name the generic type as anything, e.g. `<GenericType>`. It is named `<T>` by convention.
+* ***Note:*** You could name the generic type as anything, e.g. `<GenericType>`. It is named `<T>` here by convention.
 
 ## Exercise 1: Initializing a populated list
 <!-- _class: exercise -->

14-exceptions-threads-and-tasks.md

@@ -250,7 +250,7 @@ class Program
   {
     int waitTime = 5000;
     await Task.Delay(waitTime);
-    // Replace this with your time consuming async functionality
+    // Replace above with some time-consuming async function
     return new string(
       $"The task took {waitTime / 1000} seconds to finish."
     );
@@ -260,7 +260,7 @@ class Program
     Console.WriteLine("Starting operation...");
     Task<string> resultTask = GetResultAsync();
     Console.WriteLine("Operation has been started.");
-    Console.WriteLine("In the meantime, tell me something nice: ");
+    Console.WriteLine("In the meantime, say something nice:");
     string somethingNice = Console.ReadLine();
     resultTask.Wait(); // Wait for the task to complete
     Console.WriteLine(resultTask.Result);
@@ -280,5 +280,5 @@ class Program
 ## Exercise 3: Asynchronous Loading
 <!-- _class: exercise -->
 
-Re-create the exercise 2, but instead of using separate threads for "loading the data", use an asynchronous method `LoadDataAsync()`
+Redo exercise 2, but instead of using separate threads for "loading the data", use an asynchronous method `LoadDataAsync()`.
 

15-design-patterns-in-csharp.md

@@ -69,7 +69,6 @@ A singleton implementation could look something like this:
 <div markdown='1'>
 
 ```csharp
-
 class Program
 {
   static void Main(string[] args)
@@ -123,11 +122,9 @@ public class HomeController : Controller
 ## Design Patterns
 
 * If the concepts of a singleton and dependency injection flew over your head, don't worry about it
-
 * The important thing is to know they exist so that when they come up again in ASP.NET, you have already familiarized yourself with the terms
   * Thus, understanding the logic behind ASP.NET becomes less overwhelming
 * There are many more design patterns, see the material  [here](https://www.c-sharpcorner.com/UploadFile/bd5be5/design-patterns-in-net/)
-
   ```csharp
   public void ConfigureServices(IServiceCollection services)
   {