C# Program to print all prime numbers between 1 to n

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In this program, You will learn how to print all prime numbers between 1 to n in C#.

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Some list of prime numbers is: 2, 3, 5, 7, 11

Example: How to print all prime numbers between 1 to n in C#.

using System;
public class Program
{
	public static void Main(string[] args)
	{
		int n, i, p, k;

		Console.Write("Enter a number:");
		n = Convert.ToInt32(Console.ReadLine());

		for (i = 2; i <= n; i++)
		{
			k = 2;
			p = 1;
			while (k < i)
			{
				if (i % k == 0)
				{
					p = 0;
					break;
				}
				k++;
			}
			if (p == 1)
			{
				Console.WriteLine("Number is prime:" + i);
			}
		}

	}
}

Output:

Enter a number:50
Number is prime:2
Number is prime:3
Number is prime:5
Number is prime:7
Number is prime:11
Number is prime:13
Number is prime:17
Number is prime:19
Number is prime:23
Number is prime:29
Number is prime:31
Number is prime:37
Number is prime:41
Number is prime:43
Number is prime:47