Should I use «this.» keyword in OOP programing where it's possible to skip it? Any benifits of using it? [duplicate]

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Possible Duplicate:

开发者_如何学JAVA When do you use the “this” keyword?

In OOP sometimes we can write this.PropertyName = VALUE and sometimes we can skip this. and just write PropertyName = VALUE.

My questions:

1. Should we try always to use this.?

2. Does using / writing this have any effect on application performance or does it just make the code a little bit clearer?

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There shouldn't be any difference in performance. Its purely a style decision.