Program.cs

Console.WriteLine("Welcome to lotery game!");
Random random = new Random();
int[] numbersWinners = new int[5];
int[] numbersPlayers = new int[10];
string[] namesPlayers = new string[10];

Console.WriteLine("Players and their numbers: ");
for (int i = 0; i < numbersPlayers.Length; i++)
{
    Console.Write($"Enter name for player {i + 1}: ");
    namesPlayers[i] = Console.ReadLine() ?? string.Empty;
    numbersPlayers[i] = random.Next(1, 100);
    Console.WriteLine($"{namesPlayers[i]} has number {numbersPlayers[i]}");
}
Console.WriteLine("\n");
Console.Write("Numbers winners: ");
for (int i = 0; i < numbersWinners.Length; i++)
{
    numbersWinners[i] = random.Next(1, 100);
    Console.Write($"{numbersWinners[i]}, ");
}

Console.WriteLine("\nChecking winners...");

bool winnerFound = false;

for (int i = 0; i < numbersPlayers.Length; i++)
{
    foreach (int win in numbersWinners)
    {
        if (numbersPlayers[i] == win)
        {
            Console.WriteLine($"Congratulations {namesPlayers[i]}! Your number {numbersPlayers[i]} is a winning number!");
            winnerFound = true;
        }
    }
}

if (!winnerFound)
{
    Console.WriteLine("No winners this time. Try again!");
}