Read data from table using SQL datareader class in asp.net

public SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["SLMFConnection"].ToString());
    public string conStr = ConfigurationManager.ConnectionStrings["SLMFConnection"].ToString();
    SqlCommand cmd;


 if (con.State == ConnectionState.Closed)
        {
            con.Open();
        }

        cmd = new SqlCommand("select * from IEP", con);
        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.Read())
        {
            txtp1.Text = dr[1].ToString();
           

        }
        dr.Close();

        con.Close();