DOT NET

What is C#?
C# is pronounced "C-Sharp".

It is an object-oriented programming language created by Microsoft that runs on the .NET Framework.

C# has roots from the C family, and the language is close to other popular languages like C++ and Java.

The first version was released in year 2002. The latest version, C# 14, was released in November 2025.

C# is used for:

Mobile applications
Desktop applications
Web applications
Web services
Web sites
Games
VR
Database applications

Why Use C#?
It is one of the most popular programming languages in the world
It is easy to learn and simple to use
It has huge community support
C# is an object-oriented language which gives a clear structure to programs and allows code to be reused, lowering development costs
As C# is close to C, C++ and Java, it makes it easy for programmers to switch to C# or vice versa

SQL

Combining AND and OR
You can also combine AND and OR operators.

The following SQL selects all customers from Spain that starts with a "G" or an "R" (make sure to use parenthesis to get the correct result):

Example
Select all Spanish customers that starts with either "G" or "R":

SELECT * FROM Customers WHERE Country = 'Spain' AND (CustomerName LIKE 'G%' OR CustomerName LIKE 'R%'); 

References
https://www.w3schools.com/sql/sql_and.asp
https://www.w3schools.com/cs/cs_intro.php