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Finally, add code to compile the list of errors, throw an exception if there are errors, and either way return the collection: if (Errors.HasErrors) { throw new InvalidOperationException(); } return Errors; The completed code for the Validator class is as follows: class SendEmailCValidator:ActivityValidator { public override ValidationErrorCollection ValidateProperties( ValidationManager manager,object obj) { ValidationErrorCollection Errors = new ValidationErrorCollection(base.ValidateProperties(manager, obj)); SendEmailC sendMailActivityToBeValidated = obj as SendEmailC; if (string.IsNullOrEmpty(sendMailActivityToBeValidated.To)) { ValidationError CustomActivityValidationError = new ValidationError("To Address Not Provided", 1); Errors.Add(CustomActivityValidationError); } if (string.IsNullOrEmpty (sendMailActivityToBeValidated.From)) { ValidationError CustomActivityValidationError = new ValidationError("From Address Not Provided", 1); Errors.Add(CustomActivityValidationError); } if (Errors.HasErrors) { throw new InvalidOperationException(); } return Errors; } } Open the SendEmailC project and the SendEmailC.cs file. You now must add an attribute to the class to tie the class with the Validator class. Make sure you have the underscore (_) at the end of the line: [ActivityValidator(typeof(SendEmailCValidator))] _ To test the validator, open the CSendEmailTest project and click the properties of the SendEmailC activity. Blank out the From property. Build the solution, and the build will fail with an error message that the From e-mail address hasn t been provided.

arthurTheTurtle.RunFor(0.0); // ... } catch (InvalidOperationException e) { Console.WriteLine("Error running turtle:"); Console.WriteLine(e.Message); } catch (Exception e1) { // Loop through the inner exceptions, printing their messages Exception current = e1; while (current != null)

MySQL has its own user system The first role, which is already available after installing MySQL, is the root user Also known as a superuser, this user is capable of creating additional users and manipulating system tables like host permissions, and it can also perform database tasks It is also capable of granting permissions to non-root MySQL users, for tasks such as creating tables and triggers, using the MySQL system tables While root is also the name of MySQL s superuser, it is not the same as the root user of your Linux system The second role is that of a normal user with no special privileges to use MySQL s system tables You need to create additional normal users for your intended system users instead of superusers in order to avoid accidental changes to your current configuration.

{

}

Normal users should be granted privileges on the database and tables that they are going to use, so they can issue SQL statements Be warned that the root user does not have a password when it is created This allows the database administrator to log in to the running MySQL system and do preliminary administration like creating regular users and adding host permissions It is a good idea to change the password of this user after logging in for the first time in order to maintain security Running applications with the root user is also a bad idea MySQL users are always associated with their originating hosts This helps MySQL identify valid clients by requiring them to supply not only their user name and password, but also their host name or IP address when connecting.

} } finally { Console.WriteLine("Waiting in the finally block"); Console.ReadKey(); }

Console.WriteLine(current.Message); current = current.InnerException;

If we compile and run, we ll see the following output:

With this authentication scheme, it is not unusual to have a single username associated with different host names in MySQL For example, the root user of MySQL can connect to a MySQL server from three hosts: using the localhost hostname, using the localhostlocaldomain hostname, or using the local IP address of the machine, such as 127001 When you attempt to connect to the server using one of the hostnames of the root user, the MySQL server will consult the user system table when authenticating it If the supplied username, password, and hostname all match, the root user is allowed to connect to the server..

Arthur is at (0,0) and is pointing at angle 0.00 radians. Must provide a duration greater than 0 Parameter name: duration Waiting in the finally block

You might want to create your own exceptions for a couple of reasons: My exception is a special snowflake. I want to group my exceptions together for layered exception handling. The first of these is the most problematic. You should think very carefully about whether your exception is really special, or whether you can just reuse an existing exception type. When you introduce new exceptions, you re asking clients to understand and deal with a new type of problem, and you re expecting them to handle it in a special way. There are occasional instances of this, but more often the differences are in the context (i.e., that it was thrown from your code) rather than the exception itself (i.e., something was out of range, invalid, null, or unavailable, or it timed out). Slightly more often, you provide custom exception types when you want to provide a convenient API over some additional information that comes along with the exception. The Exception.Data property we discussed earlier might be a better solution it gives you somewhere to put information without needing to add a new kind of exception. But the convenience of a dedicated property might outweigh the costs of introducing a custom exception. Finally, you might wish to create a custom exception class to allow you to conceptually group some subsystem s exceptions together. DbException is an example of this in the .NET Framework; it represents the various errors that can occur when using a database. There are various specialized errors that derive from this, such as the SqlException thrown by the SQL Server subsystem, but the common base class