How to properly store data in a C# array

Question

So I want to store the following data to users = new DB[10];

Console.WriteLine("=====REGISTER=====");
Console.Write("What is your name? ");
name = (Console.ReadLine());
Console.Write("How old are you? ");
age = (int.Parse(Console.ReadLine()));
Console.Write("What is your gender? M for Male, F for Female");
gender = (Console.ReadLine());

Currently I have this and the problem is it only saves the first set of data I input.

while (users[i] != null)
{
    i++;
}
users[i] = new DB(name);
users[i].SaveData(name, age, gender);

where

public void SaveData(string a, int b, string c)
{
    name = a;
    age = b;
    gender = c;
}

Answer 1

You have to input data in for loop, like that:

       Console.WriteLine ("=====REGISTER=====");

        var users = new DB[10];

        for (int i = 0; i < users.Length; i++)
        {
            //input data
            Console.Write ("What is your name? ");
            name = (Console.ReadLine ());
            Console.Write ("How old are you? ");
            age = (int.Parse (Console.ReadLine ()));
            Console.Write ("What is your gender? M for Male, F for Female");
            gender = (Console.ReadLine ());
            // store data
            users[i] = new DB (name);
            users[i].SaveData (name, age, gender);
        }

Update 1:

        static DB[] users = new DB[10];

        static void Main (string[] args)
        {
            //user 1
            Registration ();
            //user 2
            Registration ();

        }

        private static void Registration ()
        {
            Console.WriteLine ("=====REGISTER=====");
            Console.Write ("What is your name? ");
            name = (Console.ReadLine ());
            Console.Write ("How old are you? ");
            age = (int.Parse (Console.ReadLine ()));
            Console.Write ("What is your gender? M for Male, F for Female");
            gender = (Console.ReadLine ());

            int i = 0;
            while (users.Length > i && users[i] != null)
            {
                i++;
            }
            if (users.Length > i)
             {
               users[i] = new DB ();
               users[i].SaveData (name, age, gender);
             }
        }

Answer 2

A solution using For loop (as suggested by AlphaDelta in the comments) and your specific situation could be:

for (int i = 0; i < users.Length; i++)
{
    if (users[i] == null) 
    {
        users[i] = new DB(name);
        users[i].SaveData(name, age, gender);
        break;
    }
}

This basically iterates your users array looking for the next null , and if found, it will save a user there, break means it stops the loop immediately.