What is the need for Strategy Pattern in C#?

If your application contains a set of algorithms wherein Client should have option to choose the suitable algorithm and the algorithms must be interchangeable, then you can implement strategy pattern to encapsulate such algorithms.

class contextClass {
private strategyClass stratObj;
public contextClass(strategyClass obj) {
stratObj = obj;
}
public void setContext() {
stratObj.triggerAlgorithm();
}
}
abstract class strategyClass {
public abstract void triggerAlgorithm();
}

The strategyClass can now be inherited by different classes and the context class can trigger any of these derived classes by using the following statements:
contextClass conObj = new contextClass(new derivedClass1());
conObj.setContext();

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