SqlConnection Issues,Unable To Extract Data From Db

Hi all,
I've created a database named HyperCodexDB.mdf and I'm trying to extract some information from, I've no error, but the code after Open() method is even not executed:
Here is the Web.Config







and in the .cs file :

Hashtable names = new Hashtable();
int i = 0;
string conn_str = ConfigurationManager.ConnectionStrings["hcConnectionString"].ConnectionString;
SqlConnection con = new SqlConnection(conn_str);
SqlCommand cmd;

cmd = new SqlCommand("SELECT Nom FROM TableRecueil", con);
SqlDataReader rdr = null;

try
{
Label1.Text = "Hello"; ////////????Here changes the value of the label
con.Open();
Label1.Text = "Bye"; ////////????But here the value of Label1.Text remains "Hello"

rdr = cmd.ExecuteReader();
while (rdr.Read())
{
names.Add(i, rdr["Nom"]);
i++;
}
Label1.Text = names[0].ToString();

}
catch (SqlException ex){ }
finally
{if (rdr != null)
{rdr.Close();}
if (con != null)
{con.Close();}}

Thanks in advance
Ali