Database encapsulation class with a transaction with parameters

Using System;
Using System.Data;
Using System.Configuration;
Using System.Web;
Using System.Web.Security;
Using System.Web.UI;
Using System.Web.UI.WebControls;
Using System.Web.UI.WebControls.WebParts;
Using System.Web.UI.HtmlControls;
Using System.Data.SqlClient;
Using System.Text;
Using System.Collections;
Namespace zj123. Sqldb
{

public class DbAccess
{
SqlConnection conn = null;
SqlCommand cmd = null;
Public DbAccess ()
{
//
TODO: Add constructor logic here
//
conn = new SqlConnection ();
Conn. ConnectionString = convert.tostring (system.configuration.configurationsettings.appsettings["datasource"));
Conn. ConnectionString = "initial catalog=idyan_new;data source=.; User ID=BT;PASSWORD=BTBTBTBT; Connect timeout=5000 ";
cmd = new SqlCommand ();
Cmd. Connection = conn;
cmd.commandtimeout = 0;

}
Public DbAccess (String constr)
{
//
TODO: Add constructor logic here
//
&nb</