Understanding the if-else Statement in C#: Syntax and Usage Explained

if-else Statement

C# also provides for a second part to the if statement, that is else. The else statement must follow if or else if statement. Also, else statement can appear only one time in a if-else statement chain.

Syntax:

if(boolean expression)
{
// execute this code block if expression evalutes to true
}
else
{
// always execute this code block when above if expression is false
}

As you can see in the above syntax, the else stament cannot contain any expression. The code block that follows else statement will always be executed, when the 'if' condition evalutes to be false.

Example: if else

int i = 10, j = 20;

if (i > j)
{
    Console.WriteLine("i is greater than j");
}
else
{
    Console.WriteLine("i is either equal to or less than j");
}

Output

  i is either equal to or less than j