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Just like Java, the C# language also provides us an important looping structure using which we could execute one or multiple statements within a loop until a condition is met. The condition of while loop is tested for the boolean value - true or false.

• If the condition is true then the block of statements in while loop are executed.
• If the condition is false then the block of statements in the while loop are skipped and not executed.

Note:

• Similar to Java, the C# language also requires a pair of braces { } to hold more than one statement i.e. multiple statements, which are to be executed within a while loop.

C# while loop example

//C# while loop example


using System;

class WhileEx1  
{

public static void Main()
{

	int i=0;

	while(i<5)
	{
		Console.WriteLine("i = " + i);
		i++;
	}
}  
}

Output

i = 0
i = 1
i = 2
i = 3
i = 4

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While loop must have an iteration part in its body or it runs an endless loop

//C# An endless while loop example


using System;

class WhileEx1  
{

public static void Main()
{

	int i=0;

	while(i<5)
	{
		Console.WriteLine("i = " + i);
		//We have not specified the iteration part of while loop
		//Hence, this while loop will run endlessly.
	}
}  
} 

Output

This program when executed, runs indefinitely in a loop and printing the initialized value of i, 0, over and over again, because of the absence of incremental part to increment the value of i.

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