quesions about Website Form compared with Console Project

Question

Hi

i started with WSP (website form) with Visual Studio and i have some little questions, compared with the classic Console project and OOP programming.

Thanks.

1)
public partial class MyClass_sel : System.Web.UI.Page
{
internal int tot=5;
//public int tot=5;
//protected int tot=5;
//private int tot=5;

private void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = tot.ToString();
    ...

Every access modifiers works. Which one is best here?
How come that Page_Load is accessible here? It's private, so ...
-----------------------------------------
2)
public partial class MyClass_sel : System.Web.UI.Page
{
    internal DropDownList dd;
    internal SqlCommand comd;
    internal string sql;
    internal SqlDataReader dtreader;

    protected void Page_Load(object sender, EventArgs e)

    {
        dd = DropDownList;
        string m = "";
        ListItem z;
       
        using (SqlConnection mConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["myconnect"].ConnectionString))
        {
            mConnection.Open();
            sql = "select distinct gem from leden";
            comd = new SqlCommand(sql, mConnection);
            dtreader = comd.ExecuteReader();
            if (dtreader.HasRows)
            {
                while (dtreader.Read())
                {
                    m = dtreader.GetString(0);
                    z = new ListItem(m);
                    dd.Items.Add(z);
                }
            }
            dtreader.Close();
            mConnection.Close();
        }
    }

    private void Button1_Click(object sender, EventArgs e)
    {
    ...

Line Button1_ClickObject is inaccessible due to protection level at line with { (just after if (dtreader.HasRows)). Why is that? Both methods are in the same class, so ...
----------------------------------------------------
3)
public partial class MyClass_sel : System.Web.UI.Page
{
public int tot;

public class Test
        {
         Label1.Text = tot.ToString();
        }
...
The name Label1 (exists in aspx file) doesn't exist in current context. How can it be reached from a class?
------------------------------------------