SqlDataReader - Pulling Multiple Values Into Multiple Variables

Hello all,
I'm trying to request a number of URLS (one for each user) from my database, then place each of these results into a separate string variables. I believed that SqlDataReader could do this for me, but I am unsure of how to accomplish this, or if I am walking down the wrong road. The current code is below (the section in question is in bold), please ignore the fact that I'm using MySQL as the commands work in the same way.
 public partial class main : System.Web.UI.Page
{
    String UserName;
    String userId;
    String HiveConnectionString;
    String Current_Location;
    ArrayList Location;
    public String Location1;
    public String Location2;
    public String Location3;
    //Int32 x = 0;

    private void Page_Load(object sender, EventArgs e)
    {
        if (User.Identity.IsAuthenticated)
        {
            UserName = Membership.GetUser().ToString();
            userId = Membership.GetUser().ProviderUserKey.ToString();
            HiveConnectionString = "Database=hive;Data Source=localhost;User Id=hive_admin;Password=West7647";

            using (MySql.Data.MySqlClient.MySqlConnection conn = new MySql.Data.MySqlClient.MySqlConnection(HiveConnectionString))
            {
                // Map Updates
                MySql.Data.MySqlClient.MySqlCommand Locationcmd = new MySql.Data.MySqlClient.MySqlCommand(
                        "SELECT Location FROM tracker WHERE Location = IsOnline = '1'");

                Locationcmd.Parameters.Add("?PKID", MySql.Data.MySqlClient.MySqlDbType.VarChar, 255).Value = userId;
                Locationcmd.Connection = conn;
                conn.Open();
                MySql.Data.MySqlClient.MySqlDataReader LocationReader = Locationcmd.ExecuteReader();

                while (LocationReader.Read())
                {
                        Location1 = LocationReader.GetString(0);
                        //Location2 = LocationReader.GetString(1); // This does not work..

                }
                
                LocationReader.Close();
                conn.Close();

                // IP Display
                MySql.Data.MySqlClient.MySqlCommand Checkcmd = new MySql.Data.MySqlClient.MySqlCommand(
                        "SELECT UserName FROM tracker WHERE PKID = ?PKID");

                Checkcmd.Parameters.Add("?PKID", MySql.Data.MySqlClient.MySqlDbType.VarChar, 255).Value = userId;

                Checkcmd.Connection = conn;
                conn.Open();
                object UserExists = Checkcmd.ExecuteScalar();
                conn.Close();

                if(UserExists == null)
                {
                    MySql.Data.MySqlClient.MySqlCommand Insertcmd = new MySql.Data.MySqlClient.MySqlCommand(
                        "INSERT INTO tracker (PKID, UserName, IpAddress, IsOnline) VALUES (?PKID, ?Username, ?IpAddress, 1)");
                    
                    Insertcmd.Parameters.Add("?IpAddress", MySql.Data.MySqlClient.MySqlDbType.VarChar, 15).Value = Request.UserHostAddress;
                    Insertcmd.Parameters.Add("?Username", MySql.Data.MySqlClient.MySqlDbType.VarChar, 255).Value = UserName;
                    Insertcmd.Parameters.Add("?PKID", MySql.Data.MySqlClient.MySqlDbType.VarChar, 255).Value = userId;

                    Insertcmd.Connection = conn;
                    conn.Open();
                    Insertcmd.ExecuteNonQuery();
                    conn.Close();
                }
                else
                {
                    MySql.Data.MySqlClient.MySqlCommand Updatecmd = new MySql.Data.MySqlClient.MySqlCommand(
                        "UPDATE tracker SET IpAddress = ?IpAddress, IsOnline = '1' WHERE UserName = ?Username AND PKID = ?PKID");

                    Updatecmd.Parameters.Add("?IpAddress", MySql.Data.MySqlClient.MySqlDbType.VarChar, 15).Value = Request.UserHostAddress;
                    Updatecmd.Parameters.Add("?Username", MySql.Data.MySqlClient.MySqlDbType.VarChar, 255).Value = UserName;
                    Updatecmd.Parameters.Add("?PKID", MySql.Data.MySqlClient.MySqlDbType.VarChar, 255).Value = userId;

                    Updatecmd.Connection = conn;
                    conn.Open();
                    Updatecmd.ExecuteNonQuery();
                    conn.Close();
                }
            }
        }
    }
 
Can anyone advise me on what I should be doing (even if its just a "you should be using this command) if this is not correct? In fact any pointers would be nice !
Thanks everyone!