using System;

public class Program

{

    public static void Main()

    {

        Console.Write("Password length: ");

        int len = Convert.ToInt32(Console.ReadLine());

        //Declare variables

        string data = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

        string pass = "";

        Random rnd = new Random();

        for (int i = 0; i < len; i++)

        {

            int n = rnd.Next(36); //36 int the length of 'data' string

            string c= data.Substring(n,1); //This function substract one char from data 

            pass += c;

        }

        Console.WriteLine("\nPassword: {0}", pass);

    }

}