The document shows the evolution of C# and VB programming languages over time. It introduces key features added in each version such as generics in C# 2.0/VB 8.0, language integrated query in C# 3.0/VB 9.0, dynamic and language parity in C# 4.0/VB 10.0, and Windows Runtime and asynchrony in C# 5.0/VB 11.0. It also provides examples of using new features like async/await for asynchronous programming.

3. C# 5.0 + VB 11.0
Windows Runtime + Asynchrony
C# 4.0 + VB 10.0
Dynamic + Language Parity
C# 3.0 + VB 9.0
Language Integrated Query
C# 2.0 + VB 8.0
Generics
C# 1.0 + VB 7.0
Managed Code

7. var
var

8. var data = DownloadData(...);
ProcessData(data);
var

9. Task<T>
IAsyncOperation<T>

11. public async Task<XElement> GetXmlAsync(string url)
{
var client = new HttpClient();
var response = await client.GetAsync(url);
var text = response.Content.ReadAsString();
return XElement.Parse(text);
}
public Task<XElement> GetXmlAsync(string url) {
var tcs = new TaskCompletionSource<XElement>();
var client = new HttpClient();
client.GetAsync(url).ContinueWith(task => {
var response = task.Result;
var text = response.Content.ReadAsString();
tcs.SetResult(XElement.Parse(text));
});
return tcs.Task;
}

12. Demo

13. async
void Task<T>
await

15. Demo

17. __FILE__ and __LINE__ macros in C#?

18. public static class Trace
{
public static void WriteLine(string message,
[CallerFilePath] string file = "",
[CallerLineNumber] int line = 0,
[CallerMemberName] string member = "")
{
Console.WriteLine(string.Format("{0}:{1} – {2}: {3}", file, line, member, message));
}
}
void Initialize() {
Trace.WriteLine("Starting services");
…
}
Trace.WriteLine("Starting services", "c:sourcesfoo.cs",
1123, "Initialize");

20. C# 5.0 + VB 11.0
Windows Runtime + Asynchrony
C# 4.0 + VB 10.0
Dynamic + Language Parity
C# 3.0 + VB 9.0
Language Integrated Query
C# 2.0 + VB 8.0
Generics
C# 1.0 + VB 7.0
Managed Code

21. Class
Meta-programming Read-Eval-Print Loop
public Foo
Language Field
DSL Embedding
Object Model
private X
string
Source .NET
File
Source code Assembly
Source code
Source code Compiler Source code

22. Language Service
Compiler APIs
Compiler Pipeline Metadata
Import

23. Demo