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to provide the name of the rule to be removed. Even applications running in Windows Azure can t connect to your server until you grant them permission to connect. Because application servers in Azure use virtual IP addresses, and the roles could shut down and restart anywhere, causing their addresses to change, there s a special rule you can use in the firewall. If you create a rule with 0.0.0.0 as the starting and ending addresses, any Azure application will be able to connect to your server. That connection must still provide a valid username and password. A common problem is making a change to the firewall and then immediately trying to access the server from that IP address, which then fails. The cache that s used to speed up firewall-rule checks refreshes every 5 minutes. If you make a rule change, it s worth waiting up to 5 minutes before trying to see if the change works. The second line of defense is the use of SQL credentials to verify that people are allowed to connect to your database.

Called by data binding to tell the object to take a snapshot of its property values Called by data binding to tell the object to undo any changes, restoring the property values to the snapshot taken when BeginEdit() was called Called by data binding to tell the object to accept any changes, effectively discarding the snapshot taken when BeginEdit() was called

DataPortal_Execute()

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Managing user accounts in SQL Azure works much the same way as in on-premises SQL Servers. A few small differences can be found, mostly with the names of specific roles, but in general it s the same. Your first step in granting someone access to a database is to create a login for the server itself. You need to connect to the master database in your server using an account with the loginmanager role. This would normally be the administrator account you created when you created your server, but any other account with that role will work. Once connected, you can list the existing logins by executing the sys.sql_logins view. To create a login, use the same command you re used to, as shown in figure 13.13:

DataPortal_OnDataPortalInvoke() DataPortal_OnDataPortalInvokeComplete() DataPortal_OnDataPortalException()

This doesn t sound that hard, until you read the fine print in the documentation and start using the interface and then discover the even finer print that isn t actually in the documentation at all.

CREATE LOGIN theloginname WITH password='strongpasswordhere';

There are several ways the framework might ensure that the appropriate methods are implemented on each business object A formal interface or abstract base class could be used to force business developers to implement each method Alternatively, a base class could implement virtual methods with default behaviors that could optionally be overridden by a business developer Finally, it is possible to use reflection to dynamically invoke the methods Since not all objects will implement all the methods listed in Table 4-10, the idea of an interface or base class with abstract methods isn t ideal Another negative side-effect of those approaches is that the methods end up being publicly available, so a UI developer could call them Of course, that would be problematic, since these methods will be designed to be called only by the data portal infrastructure.

Figure 13.13 Creating a new SQL Azure login the same as with SQL Server on-premises, using the CREATE LOGIN command.

Many of the lessons I ve learned and the issues I ve solved in the data binding implementation in CSLA .NET are due to a lot of hard work and research by the CSLA .NET community at http://forums.lhotka.net. Without the strong support and involvement by numerous people, many of the hard challenges would likely still be unsolved.

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