Gain insights into fundamental and advanced C# programming concepts. Learn about conditional statements, loops, methods, arrays, classes, inheritance, interfaces, and delegates through practical challenges.

This course introduces you to fundamental programming concepts in C#, one of the most popular languages in the world. The highly interactive course begins with a simple Hello world program and proceeds on to cover common concepts such as conditional statements, loop statements, and methods in C#. It also reflects upon the idea of arrays as well as the power they give to the programmer to write better code. Finally, it dives deeper in order to teach about advanced concepts such as classes, inheritance, interfaces, and delegates in C# through interactive challenges and exercises.

C# for Programmers: A Practical Guide

Programming in general often requires a *decision* or a *branch* within the code to account for how the code operates under different inputs or conditions. 

Within the **C#** programming language, the simplest and sometimes the most useful way of creating a branch within your program is through an `If-Else` statement.

# If-Else Block

As with most of C#, the if statement has the same syntax as in C, C++, and Java. Thus, it is written in the following form:




if (condition)
{
  // Do something
} 
else
{
  // Do something else
}

>**Note:** The two execution sections are *mutually exclusive*. Meaning only **one** of the two sections can execute at a time based on the result of the boolean expression.

The `if` statement evaluates its **condition** expression to determine whether to execute the `if`-body. Optionally, an `else` clause can immediately follow the `if` body, providing code to execute when the condition is `false`.

# If-else Example

Let's take a look at an example implementing the `if-else` statement. 

In the example below, you'll pass a value of **score** for a subject and the program will output whether you *passed* or *failed* the course depending on the score.

>**IMPORTANT NOTE:** In the example below before you click `RUN` to execute the code click the `>_STDIN` button first. An input bar will appear. Enter any value of score there and then click the `RUN` button. If you don't enter the value first a run time **ERROR** will occur.

This lesson discusses if-else statements in detail including nested-ifs and if-else if-else statements using examples

Introduction

Variables and Casting

Operators

Conditions

Loops

Arrays

Methods

Exception Handling

Classes

OOP in C#

Delegates

C# Exam

If-Else Statement

If-Else Block