Difference and realtime usage with C# variable declarations

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What is the difference between the following declarations?

Declaration 1

C#

int A;

Declaration 2

C#

int a;
public int A
{
    get { return a; }
    set { a = value; }
}

Declaration 3

C#

public int A { get; set; }

Posted 13-Apr-11 18:11pm

Sridhar Patnayak

Updated 13-Apr-11 23:16pm

Toli Cuturicu

v5

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Pong D. Panda 14-Apr-11 0:48am

Just a tip, dont use Int32 as a member type declaration, always use the alias on your code (int is the alias of int32).

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**JF2015** · Answer 1 · 2011-04-13T18:18:00

To understand that completely you should read about properties in .NET:
http://msdn.microsoft.com/en-us/library/aa288470%28v=vs.71%29.aspx[^]
http://www.devarticles.com/c/a/C-Sharp/Understanding-Properties-in-C-Sharp/[^]

Declaration 1: "A" is only private - can't access it from outside of your class.
Declaration 2: "a" is private and "A" is a property that allows accessing "a"
Declaration 3: "A" is a property without any underlying private member - so you can use both (2 and 3) to access a member of your class from outside.

Wild-Programmer · Answer 2 · 2011-04-13T18:18:00

Solution 2

Actually, the Declaration 1 is normal variable declaration of type Int32.
Declaration 2 is a Getter Setter defined in .NET in order to achieve validated input and output of variable.
Declaration 3 is same as Declaration 2.

Posted 13-Apr-11 18:18pm

Wild-Programmer