Membership Provider 构造函数
public SqlMembershipProvider ();
Public Sub New ()
构造函数由 ASP.NET 调用，以创建在应用程序的SqlMembershipProvider配置中指定的类的实例。 SqlMembershipProviderThe SqlMembershipProvider constructor is called by ASP.NET to create an instance of the SqlMembershipProvider class as specified in the configuration for the application. 不应在代码中使用此构造函数。This constructor is not intended to be used from your code.