C# 6.0 features:
1. using static System.Console;
Example:
 using static System.Console;
 class Program
    {
        static void Main(string[] args)
        {
            WriteLine("Hello World!");
        }
    }


2. String interpolation.
Example:
WriteLine($"{firstName} {lastName} is my name!");

3. Null conditional operators.

4. Getter only auto properties.

5. Auto property initializers in C#

6. Parameterless constructor for structs

7. Dictionary Initialisation

8. await in catch and finally

9. Exception Filters
Example:
C#5.0:
catch (Exception ex)
{
if (ex.Message.Equals("500"))
Write("Bad Request");
}
C# 6.0
catch (Exception ex) when (ex.Message.Equals("400"))
{
Write("Bad Request");
ReadLine();
}

C# 7.0 features:
1. Local function / nested function
2. We can use out variable on the fly,
Example:
static void Main(string[] args) {
        string s = "26-Nov-2016";
        if (DateTime.TryParse(s, out DateTime date))
{
            WriteLine(date);
        }
        WriteLine(date);
    }
3. Tuples
4. Expression bodied methods / Constructors / getssers / setters
5. Throw expressions

Invoke Vs BeginInvoke:
Delegate.Invoke: Executes synchronously, on the same thread.
Delegate.BeginInvoke: Executes asynchronously, on a threadpool thread.
Control.Invoke: Executes on the UI thread, but calling thread waits for completion before continuing.
Control.BeginInvoke: Executes on the UI thread, and calling thread doesn't wait for completion.

Dependency Injection:
1.
Interface ILogger
{
OpenLog();
Log();
CloseLog();
}

2.
Class FileLogger() : ILogger
{
public string LogFileName { get; private set; }

public FileLogger(string logFileName)
{
LogFileName = logFileName;
}

public void OpenLog()
{
//
}

public void Log()
{
//
}

public void CloseLog()
{
//
}
}

3.
Class LoggerEngine()
{
ILogger _logger;

public LoggerEngine(ILogger logger)
{
_logger = logger;
}

public void log(string message)
{
_logger.OpenLog();
_logger.Log(message);
_logger.CloseLog();
}
}

4.
Create Client Class IoCThirdParty
{
public string FileName { get; set; }

public void Write(string message)
{
Logger ip = new Logger(FileName);
var obj = new LoggerEngine(ip);
obj.log(message);
}
}

5.
Use Client Class IoCThirdParty
class Use
{
static void main()
{
IoCThirdParty obj = new IoCThirdParty(){FileName="C:\log.txt"};
obj.Write("Hello man!");
}
}

Having pimples problem?

Teenagers,

If you feel pimple problems in your face try this,

Take 5/10 grams of "Fenugreek"("வெந்தயம்" in tamil language) and soak it in water before night; Next day morning drink that water and eat the saturated "Fenugreek".

It will reduce the body temporature / clean the stomach and importantly helps to get rid of the pimples. It avoids pimples getting created as well as reduce the already created pimple bump. Try once and you'll definitely feel it.