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  What is most important in programming language : There are some basic things. which are  important for programming. Data Structures and Algorithms   1.     Basic syntax. 2.     Data type and structures. 3.     Conditionals and loops Source Control or Version Control System 4.     Functional programming. 5.     Object-oriented programming. 6.     Debugging. Text Editors   7.     IDEs and coding environments . What is the most important thing to keep in mind when learning a programming language  So the most important thing to keep in mind when learning a programming is learning skills because the coding language change day by day. so it is important to update yourself day by day  

What is new in c# 9. How we can use it in programming  There are new features in the last few versions of C# had made it easy to write shorter and simpler code. C# 9 is no exception to that. Records, new types of syntax, and more other features can make your code much more expressive. In certain cases, you can avoid writing a lot of more code that was previously needed. C# 9.0 introduces record types. You use the record keyword to define a reference type that provides built-in functionality for encapsulating data. provides built-in functionality for encapsulating data:  public record Person(string First_Name, string Last_Name); property definition of Positional syntax  Exp :Person person = new("Nancy", "Davolio");   Immutability : Immutability can be useful when you want a data-centric type to be thread-safe or a hash code to remain the same in a hash table.  Nondestructive mutation and more new features. C# 9 also allow you to use a more specific return typ