Named parameters:-

       The concept of named parameters was introduced in C#4.0 and main purpose was to pass the parameter by name not the position. This features provide us the liberty to pass the parameter at any position without bothering its position in parameter list and code looks more clear and readable.

Example:-

 public int CalculateArea(int width, int height)
 {
            // Calculate are
 }

I have method named CalculateArea which calculates the area based on width and height. If we have to call this function we will have to provide the width as the first argument and height as the second argument otherwise result might not be correct but named parameters provides us the liberty to pass the parameter at any order just by specifying the name of the parameter. please see below code how to call the function by named parameters

   CalculateArea(10, 20);
   CalculateArea(width: 10, height: 20);
   CalculateArea(height: 20, width: 10);

In above three lines of code I have used 3 types of calling conventions. In the first line of code I have used conventional way of calling the function by passing the values in ordered way, In second line code I have used the named parameters by specifying the name of parameter for which the values is being passed and in third line of code I have changed the order of parameters which would not impact the result. All of above call would return the same result.