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The general principle of the nested-if decision-making statement is that, an if statement is nested inside another if statement, hence this control structure is named nested if.

The statement connected to the nested if statement is only executed when -:

• The condition of its outer if statement is true, and
• The condition of this nested if statement is also true.

Note:

• There could be an optional else statement associated with the outer if statement, which is only executed when the condition of the outer if statement is evaluated to be false and in this case, the condition of nested if condition won't be checked at all.
• Similar to its cousin Java, the C# language also requires a pair of braces { } to hold more than one statement i.e. multiple statements associated with an if or else statement

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Nested if example

So let us see an example of nested if statement, and we are also going to associate an optional else statement with the outer if statement, which may only execute if the condition of outer if statement is evaluated to be false.

//C# Example of nested if statement 

using System;

class NestedIfEx
{

public static void Main()
{
	int a = 99, b = 100, c = 101;
	if(a<b)
	{
		if(a<c)  // This is a nested if 
		Console.WriteLine("{0} is less than {1} & {0} is also less than {2}", a, b, c );
	}
	else 
		Console.WriteLine("{0} is not less than {1}", a, b);
		
}
}

Output

99 is less than 100 & 99 is also less than 101

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< C# Else If Statement

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