C# :: Lottery Console Program - User Input

I have an a problem I need to make lottery random generation program what asks from user how many lines to gerenate random numbers. But i am now stuck.

Console.WriteLine(" choose how many numbers ");
int i = int.Parse(Console.ReadLine());
Random randomizer = new Random();
for(int j = 0; j < 7; j++) {
i = randomizer.Next(1, 39);
}
Console.WriteLine("Your random numbers are{0}", i);
Console.ReadLine();