C# if-else

In C# programming, the if statement is used to test the condition. There are various types of if statements in C#.

• if statement
• if-else statement
• nested if statement
• if-else-if ladder

C# IF Statement

The C# if statement tests the condition. It is executed if condition is true.

Syntax:

C# If Example

Output:

It is even number

C# IF-else Statement

The C# if-else statement also tests the condition. It executes the if block if condition is true otherwise else block is executed.

Syntax:

C# If-else Example

Output:

It is odd number

C# If-else Example: with input from user

In this example, we are getting input from the user using Console.ReadLine() method. It returns string. For numeric value, you need to convert it into int using Convert.ToInt32() method.

Output:

Enter a number:11
It is odd number

Output:

Enter a number:12
It is even number

C# IF-else-if ladder Statement

The C# if-else-if ladder statement executes one condition from multiple statements.

Syntax:

C# If else-if Example

Output:

Enter a number to check grade:66
C Grade

Output:

Enter a number to check grade:-2
wrong number