Quickest muscle building Techniques... 

1. Eating is 80% of your success...make sure you increase your calories
2. Eat every 2.5-3 hours
3. Eat 6 to 7 meals per day (this includes snacks)
4. Eat at least 2.5 grams of protein per kilo of body weight per day
5. Eat 25% of your daily protein intake immediately after training in a post workout snack/meal
6. In the above mentioned post workout meal, also include plenty of high glycemic carbs such as rice and pasta
7. There is a window of opportunity open for around 30 minutes after training...so make sure you eat your post workout meal/snack in this timeframe.
8. Whey protein is the best source of post workout protein because of its high bioavailability and biological value, high BCAA content and easy/fast digestion. 
9. Get plenty of variety in your sources of protein and carbohydrates
10. Eat plenty of fruit and nuts in your between meal snacks

NOTE: 4 of the above points were to do with your post workout snack...this should emphasise the importance of this meal