C# 6.0 New Feature

Assign value to member

C# 5.0	C# 6.0
Value[first] =”Nikhile”	Value. $first = “Nikhil”

Exception Filters:

Exception filter already support in Vb.net now C#.net as well start to support .Exception filter is nothing but in catch block we can specify If Condition.
IF condition is fail inside catch block statement it won’t execute.

C# 5.0	C# 6.0
try             {       }             catch (Exception ex)             {       }	Try  {      throw new Exception("Null Error");           } catch (Exception ex) if (ex.Message == " IndexError")             {                 // this one will not execute.             }             catch (Exception ex) if (ex.Message == " Null Error ")             {              // this one will execute             }

Previous version C# not support await keyword in catchblock and finally block ,Now in c# 6.0 start supporting

C# 5.0	C# 6.0
try             {                 DoSomething();             }             catch (Exception)             {              //Its not Support here                 await LogService.LogAsync(ex);             }	try             {                 DoSomething();             }             catch (Exception)             {                // New feature it will support                 await LogService.LogAsync(ex);             }

This feature allows you to declare local variable in the middle of an expression. It is as simple as that but really destroys a pain.

C# 5.0	C# 6.0
Int  Qty; Int.TryParse(txtnumber.Text, out Qty)	Int.TryParse(txtnumber.Text, Int out Qty)

In C# 6.0 added new feature called auto propertyinitialize like below
public class Person
{
// You can use this feature on both
//getter only and setter / getter only properties
public string FirstName { get; set; } = "Nikhil";
public string LastName { get; } = "Jagathesh";
}
A primary constructor allows us to define a constructor for a type and capture the constructor parameters to use in initialization expressions throughout the rest of the type definition. Here’s one 

simple example:

//this is primary constructor

public Class Money(string currency, decimal amount)
{
public string Currency { get; } = currency;
public decimal Amount { get; } = amount;
}

C# 5.0	C# 6.0
Dictionary country = new Dictionary()             {                 { "India", "TN" },                 { "United States", "Washington" },                 { "Some Country", "Some Capital " }             };	Dictionary country = new Dictionary()             {                 // Look at this!                 ["Afghanistan"] = "Kabul",                 ["Iran"] = "Tehran",                 ["India"] = "Delhi"             };

This is an exception that almost always indicates a bug because the developer didn’t perform sufficient null checking before invoking a member on a (null) object.

Look below new feature very interesting

C# 5.0	C# 6.0
public static string Truncate(string value, int length) {   string result = value; //this pain work for us   if (value != null) // Skip empty string check for elucidation   {     result = value.Substring(0, Math.Min(value.Length, length));   }   return result; }	public static string Truncate(string value, int length) {            return value?.Substring(0, Math.Min(value.Length, length)); }