advantage of properties:

1 properties can be used in data binding, public data member can not.

2 data validation can be wrote inside setter method. easy to implement, also multithread feature.

3 the access level of getter and setter method can be restricted using public, protected and private key word

4 properties can be used in abstract interface.

5 indexers of properties is possible.

6 getter and setter methods should not be time consuming or complex method. Such as database processing is not recommended. 

c# Use Properties Instead of Accessible Data Members