classes with internal variable-definitions

I found many examples with confusing class-definitions:

variable-declaration and direct assignment, but no standard-constructor.

Are constructors needles or is this a renewal in C#6?

Example: class Table { public int[] number = new number[10];}

class Table { public int[] number = new number[10];}

The code above mention is using auto property initialzier and it is features C# 6.0;

Property can be initialize without constructor in C# 6.0.

Please see below sample code .

1. Auto Property Initialzier

Before

The only way to initialize an Auto Property is to implement an explicit constructor and set property values inside it.

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public class AutoPropertyBeforeCsharp6 {     private string _postTitle = string.Empty;     public AutoPropertyBeforeCsharp6()     {         //assign initial values         PostID = 1;         PostName = "Post 1";     }      public long PostID { get; set; }      public string PostName { get; set; }      public string PostTitle     {         get { return _postTitle; }         protected set         {             _postTitle = value;         }     } }

After

In C# 6, auto implemented property with initial value can be initialized without having to write the constructor. We can simplify the above example to the following:

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public class AutoPropertyInCsharp6 {     public long PostID { get;  } = 1;      public string PostName { get; } = "Post 1";      public string PostTitle { get; protected set; } = string.Empty; }

Plz refer C# 6.0 new features.

http://www.codeproject.com/Articles/874205/New-features-in-Csharp/