Design patterns
Design
patterns are considered to be best solution for application design based
problems. When we design application or have to implement any task. We have
multiple ways to perform that task but we should try to perform that task in
best way. There are many tasks/problems, we face frequently whilst development
or designing application so there are best solutions for such common problems
given by gurus. Design patterns help a lot to minimize frequent and complex
problems.
Following
are few examples (problems), which could help you in understanding what kind of
problems are resolved by design patterns.
- You want to
undo work done by user one or multiple times
- Suppose you
don’t need to let create multiple objects of same class at a time in any
case.
- You don’t know
exact class type of which you would need to create object whilst
programming/coding.
- You need to
change behavior of object without changing of class implementation.
- You might need
to have different behavior of same object on change of state of object.
Aforementioned
points are just to give you sense of types of problems/tasks, you could have
whilst application development and designing.
for complete article on design patterns please click on following link where i have uploaded my article http://www.worldofasp.net/tut/designpattern/Design_Patterns_210.aspx