public JsonResult myControllerMethod() // Action Controller
{
    using (AdsConnection conn = new AdsConnection(connString))
    {
    conn.Open();
    AdsTransaction txn = conn.BeginTransaction(); // Begin Transaction
    try
    {
        MyModel mo = new MyModel();
        mo.doProcess(conn); // pass connection to model
        txn.Commit();
        return Json(new { success = true });
    }
    catch (Exception e)
    {
        txn.Rollback();
        return Json(new { success = false, message = e.Message });
    }
    }
}

public void doProcess(AdsConncection conn){ // Model
    try{
        ..
        //AdsCommand select, update, delete and insert....
        ..
    }catch(Exception e){
        throw e;
    }
}