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Listing 2-13. Deleting a Directory That Has Contents [juan@srv1-manila ~]$ rmdir scripts rmdir: scripts: Directory not empty The scripts folder contains the file test1, so we need to remove that before we can delete the scripts folder. The command for deleting a file is rm, which accepts a filename to delete as an argument. To delete the test1 file, run the command rm scripts/test1, as shown in Listing 2-14. Listing 2-14. Deleting a File [juan@srv1-manila ~]$ rm scripts/test1 [juan@srv1-manila ~]$ ls scripts [juan@srv1-manila ~]$ As you can see, test1 has now been deleted from the scripts folder. You can now delete the scripts directory, as shown in Listing 2-15. Listing 2-15. Deleting an Empty Directory [juan@srv1-manila ~]$ rmdir scripts [juan@srv1-manila ~]$ ls Desktop You can also delete files with similar names using wildcards. For example, to delete files that end with .tmp, you can issue the command rm *.tmp, where * could be zero or more characters.

If you compile and run this code, you ll see the following output:

Arthur is at (0,0) and is pointing at angle 0.00 radians. In the Turtle finally block Arthur is at (0,10) and is pointing at angle 0.00 radians. In the Turtle finally block Some problem with the turtle has occurred The PlatformWidth must be initialized to a value > 0.0 Waiting in the finally block

So our finally block executes after the exception is thrown, but before it executes the exception handlers farther up the stack.

Caution: If you need to delete a directory regardless of what files it contains, you can use the rm rf <directory> command. The r option means recursive deletion, while f means that it will delete the files without asking for your consent. Be careful when using these options, because you might accidentally delete files you don t want to delete.

One important question remains: how did we know what exception type to catch from our code Unlike some other languages (e.g., Java) there is no keyword which allows us to specify that a method can throw a particular exception. We have to rely on good developer documentation. The MSDN documentation for the framework itself carefully documents all the exceptions that can be thrown from its methods (and properties), and we should endeavor to do the same. The .NET Framework provides a wide variety of exception types that you can catch (and often use). Let s revisit Table 6-1 (the common error types) and see what is available for those situations (see Table 6-2).

Table 6-2. Some common errors and their exception types Error Unexpected input Description A client passes data to a method that is outside some expected range. Examples

catch { throw; } } Return to the CSendEmailTest project and the Workflow1.vb file. Set the properties for the SendEmailC activity accordingly and test the workflow. The address provided in the To property should receive an e-mail. As mentioned earlier in this section, you can add a Validator class to your activity. Add a new class to the SendEmailC project called SendEmailCValidator. Add the following to the using statements: using System.Workflow.ComponentModel.Compiler This class will inherit from the System.Workflow.ComponentModel.Compiler.ActivityValidator class and override the ValidateProperties function of this class. To do this, add the following lines of code: class SendEmailCValidator:ActivityValidator { public override ValidationErrorCollection ValidateProperties (ValidationManager manager,object obj) { } } The ValidateProperties function returns a ValidationErrorCollection, so you must define one within this function to return. Also define an instance of the activity that you want to validate: ValidationErrorCollection Errors = new ValidationErrorCollection(base.ValidateProperties(manager, obj)); SendEmailC sendMailActivityToBeValidated = obj as SendEmailC; Next, add code to validate the To and From properties of the activity, and add errors to the collection if necessary: 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); }

Storage engines in MySQL define how it stores data in the tables of its databases. Some storage engines are designed for speed, while others are built for using standard SQL language features, such as transactions and foreign keys. The two common storage engines that you can use immediately are MyISAM and InnoDB. MyISAM is MySQL s implementation of the Indexed Sequential Access Method (ISAM), a fast method for retrieving data that also provides FULLTEXT search capabilities on tables that use this storage engine. MyISAM is supported in all MySQL configurations and is the default storage engine when you do not specify any in creating your tables. Because the focus of MyISAM is speed, it does not support some standard SQL database features. These include transactions and the use of foreign keys for relational integrity. If you need both features, you need to use another storage engine for your tables. InnoDB was created to provide the missing features of MyISAM and is an improved storage engine. It can recover faster from crashes and has increased data reliability thanks to its ACID compliance. For database users who require relational integrity, InnoDB also supports the creation of foreign keys to enable table joins. There are other storage engines that you can use, and you can learn more about them at http://dev.mysql.com/doc/refman/5.0/en/storage-engines.html.

Unexpected data type Unexpected data format Unexpected result Unexpected method call Unavailable resource Contended resource