C# Online Compiler | .NET Fiddle

using System;
using System.Collections.Generic;
using System.Linq;
					
public class Program
{
	public static void Main()
	{
		List<int> numbers = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17 };

		var primeNumbers = numbers
			.Where(n => PrimeNumberFinder.IsPrime(n))
			.OrderBy(n => n)
			.ToList();

		foreach (var prime in primeNumbers)
		{
			Console.WriteLine(prime);
		}
	}
}

public class PrimeNumberFinder
{
    public static bool IsPrime(int number)
    {
        if (number <= 1) return false;
        if (number == 2) return true;
        if (number % 2 == 0) return false;

        var boundary = (int)Math.Floor(Math.Sqrt(number));

        for (int i = 3; i <= boundary; i += 2)
        {
            if (number % i == 0) 
                return false;
        }

        return true;
    }
}

 
using System;
using System.Collections.Generic;
using System.Linq;
                    
public class Program
{
    public static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17 };
​
        var primeNumbers = numbers
            .Where(n => PrimeNumberFinder.IsPrime(n))
            .OrderBy(n => n)
            .ToList();
​
        foreach (var prime in primeNumbers)
        {
            Console.WriteLine(prime);
        }
    }
}
​
public class PrimeNumberFinder
{

Unhandled exception. System.Security.Cryptography.CryptographicException: The input data is not a complete block.
   at System.Security.Cryptography.SymmetricPadding.GetCiphertextLength(Int32 plaintextLength, Int32 paddingSizeInBytes, PaddingMode paddingMode)
   at System.Security.Cryptography.UniversalCryptoEncryptor.UncheckedTransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount)
   at System.Security.Cryptography.CryptoStream.FlushFinalBlockAsync(Boolean useAsync, CancellationToken cancellationToken)
   at System.Security.Cryptography.CryptoStream.FlushFinalBlock()
   at System.Security.Cryptography.CryptoStream.Dispose(Boolean disposing)
   at System.IO.Stream.Close()
   at System.IO.StreamWriter.CloseStreamFromDispose(Boolean disposing)
   at System.IO.StreamWriter.Dispose(Boolean disposing)
   at System.IO.TextWriter.Dispose()
   at Program.Encrypt(Int32 key, String plainText, Int32 iv)
   at Program.Encrypt(Int32 key, String plainText, Int32 iv)
   at Program.Main()
Command terminated by signal 6