调用dbml数据连接

<configuration>
  <connectionStrings>
    <add name="DataBaseConnectionString"
       connectionString="data source=10.100.68.209;Initial Catalog=SSBU_EPlat_db;User ID=sa;Password=admin-123"
       providerName="System.Data.SqlClient" />
  </connectionStrings>
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</configuration>

 

 

    (DBML Name is SSBU_EPlat_DBClassDataContext)
      (bll.cs)
   public  class AttendanceRepository
    {
       SSBU_EPlat_DBClassDataContext db;
       public AttendanceRepository(string connnectString)    //构造函数
       {
           db = new SSBU_EPlat_DBClassDataContext(connnectString);
       }
 

    }

 

      (GlobalParameter.cs)
public static  class GlobalParameter
    {
        private static string connString = System.Configuration.ConfigurationManager.ConnectionStrings["DataBaseConnectionString"].ConnectionString;
    }

     (asp.cs)

bll bl = new bll(GlobalParameter.connString)