Best coding practice?

What's the best coding practice?

1.

Code:

private int number;
public int { get { return number;} set { number = value; } }

Code:

public int Number{ get; set; }

Code:

private int number;
public int GetNumber{ get { return number; } }
public int SetNumber{ set { number = value; } }

I see the third one being used in Visual Studio. Is there any particular reason why either of these are bad ( or good ) ?

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