if Statement :

The main format of the conditional statements if is as follows:

Syntax :

if (Boolean expression)
{
Body of the conditional statement;
}

The Boolean expression can be a Boolean variable or Boolean logical expression. Boolean expressions cannot be integer (unlike other programming languages like C and C++).

The body of the statement is the part locked between the curly brackets ( { } ). It may consist of one or more operations (statements). When there are several operations, we have a complex block operator.

Example :

/* Description: simple if program */ using System; namespace DemoProgramming { class Program { static void Main(string[] args) { int myNumber = 5, OtherNumber = 4; if (myNumber == OtherNumber) { Console.WriteLine("This is same number."); } //Black Screen Cause The Condition is not true (5==4) Console.ReadKey(); } } }

Output :

if-else Statement :

In C#, as in most of the programming languages there is a conditional statement with else clause: the if-else statement. Its format is the following:

Syntax :

if (Boolean expression)
{
Body of the conditional statement;
}
else
{
Body of the else statement;
}

Example :

/* Description: simple if-else program */ using System; namespace DemoProgramming { class Program { static void Main(string[] args) { int myNumber = 5; if (myNumber == 5) { Console.WriteLine("This is same number."); } else { Console.WriteLine("This is not same number."); } Console.ReadKey(); } } }

Output :