what is design patterns? which design patterns mostly used in .net? How it is used with examples?

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Guys ... i cant post all of the DP samples ..nonetheless u
get it over the internet but i can just brief u bout the
Design patterns

1. Design patterns are the general solutions to the design
problems.... (Though they dont give you the code)

2. Design patterns show how to build systems with good OO
design qualities

3. Design patterns provide a shared language that can
maximize the value of ur communication with other developers

The patterns that are commonly used in .NET

1.Facade -- business obj invoked by UI thru Facade

2.Composite -- Menu ctrl designed thru Composite pattern

3.Strategy -- lets the algorithm vary indep'ly from
clients that use it

4.Observer -- Error logging and tracing implemented
using this pattern

5.Abstract Factory -- solves the problem of accessing diff
databases

6.Singleton -- one instance

7.Proxy -- Used in cases of Just in Time Loading..

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