.net MVC 連接數據本地數據庫三種方法

  <appSettings>   <add key="webpages:Version" value="2.0.0.0" />   <add key="webpages:Enabled" value="false" />   <add key="PreserveLoginUrl" value="true" />   <add key="ClientValidationEnabled" value="true" />   <add key="UnobtrusiveJavaScriptEnabled" value="true" />   <add key="con" value="server=./sqlexpress; user id = sa;password = a123456;database = xsgl1;max pool size=512;"/>  </appSettings>  <connectionStrings>   <add name="conSql" connectionString="server=(local)/sqlexpress; User Id = sa;password = a123456;database = xsgl1;max pool size=512;"/>  </connectionStrings> Configuration

  public class HomeController : Controller   {     //     // GET: /Home/      public ActionResult Index()     {       #region connect sql function one       SqlConnectionStringBuilder one = new SqlConnectionStringBuilder();       one.DataSource = "(local)//sqlexpress";      one.InitialCatalog = "xsgl1";       one.UserID = "sa";       one.Password = "a123456";       one.MaxPoolSize = 512;       SqlConnection sct = new SqlConnection(one.ConnectionString);       #endregion       #region connect sql function two       //string conn = ConfigurationManager.AppSettings["con"].ToString();       //SqlConnection sct = new SqlConnection(conn);       #endregion       #region connect sql function three       //string conn = ConfigurationManager.ConnectionStrings["conSql"].ConnectionString;       //SqlConnection sct = new SqlConnection(conn);       #endregion       SqlCommand scm = new SqlCommand();       scm.Connection = sct;      scm.CommandType = CommandType.Text;       scm.CommandText = "select 課程名 from kc where 課程號='A001'";       sct.Open();       SqlDataReader sdr = scm.ExecuteReader();       if (sdr.Read())       {        ViewBag.hao = sdr["課程名"];      }      sdr.Close();      return View();    }    public ActionResult About()    {      return View();     }   }Controller

@{  ViewBag.Title = "Index"; } @ViewBag.hao <h2>Index</h2>