Question:what is optional parameters and named arguments? 

Answer Parameters are optional when a default value is specified as part of a declaration.
Example: public List<Product> GetProductByCategory(string category, int pageIndex=0){}
Here pageIndex is an optional parameter.
Named arguments allow us to explicitly name an argument we are passing to a method – instead of just identifying it by argument position. 
Example: var products= GetProductByCategory(“beverages”, pageIndex=2){} here pageIndex is a named argument. 

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