2 Programming Exercises 2.1 Write an interactive C# program that includes a named constant repre- senting next year's anticipated 20% raise for each employee in a company. Now, declare a variable to represent the current salary of an employee that ac- cepts user input, and display, with explanatory text, the old salary, the value of the raise, and the new salary for the employee. A sample run follows. Enter your name: John Hello John! Enter your current salary: 2008 old salary is $2000 plus $400 raise equals $2400 as a new salary! Press any key to continue ,