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In this chapter, we reviewed the various types of errors that might occur in our software and looked at several strategies for handling them. These include ignoring the problem, aborting the application, returning errors, and throwing exceptions. We also saw some of the benefits and pitfalls of returning errors, and how exceptions can often provide a more robust and flexible means of alerting your clients to problems. We saw how we can handle exceptions in layers, sometimes catching, using, and then rethrowing an exception, sometimes wrapping an implementation exception in a public exception type, and sometimes allowing exceptions to bubble up to the next layer of handlers. We saw what happens when an unhandled exception pops out at the top of the stack, and how we can use finally blocks at each layer to ensure that application state remains consistent, and resources can be released, whether exceptions occur or not. We then took a quick review of some of the most common exceptions provided by the framework, and how we might use them. Finally, we looked at creating our own exception types and why we might (and might not) wish to do so. We ve come a long way in the past few chapters, covering all of the everyday C# programming concepts you ll need. In the next few chapters, we ll look at features of the .NET Framework in more detail, and how we can best use them in C#; starting with the collection classes.

Note: Assume that your MySQL server, with the hostname pvcserver.com, has an entry for the root user

An appdomain is a kind of process within a process. We ll talk about them a little more in 11 and 15, but they re mainly used by systems that need to host code, such as ASP.NET.

Most programs have to deal with multiple pieces of information. Payroll systems need to calculate the salary of every employee in a company; a space battle game has to track the position of all the ships and missiles; a social networking website needs to be able to show all of the user s acquaintances. Dealing with large numbers of items is a task at which computers excel, so it s no surprise that C# has a range of features dedicated to working with collections of information. Sets of information crop up so often that we ve already seen some of what C# has to offer here. So we ll start with a more detailed look at the collection-based features we ve already seen, and in the next chapter we ll look at the powerful LINQ (Language Integrated Query) feature that C# offers for finding and processing information in potentially large sets of information.

The ability to work with collections is so important that the .NET Framework s type system has a feature just for this purpose: the array. This is a special kind of object that can hold multiple items, without needing to declare a field for each individual item. Example 7-1 creates an array of strings, with one entry for each event coming up in one of the authors calendars over the next few days. You may notice a theme here (although one misfit appears to be a refugee from an earlier chapter s theme, but that s just how the author s weekend panned out; real data is never tidy).

Figure 8-5. Name and Description properties of the new activity This activity needs to accept two parameters. The first is the connection string to use, and the second is the SQL statement to execute. This activity also needs to return two parameters. The first is for success or failure, and the other is a number. You can use this number when inserting a record to show the ID of the newly inserted record. If this doesn t apply, just add a 0. The next step is to define the properties. To do this, view the code of the ExecuteSQL activity, and you ll see the class structure. Add the property code so the class looks like the following: Public Class ExecuteSQL Inherits System.Workflow.ComponentModel.Activity Public Shared ConnectionStringProperty As DependencyProperty = DependencyProperty.Register("ConnectionString", GetType(String), GetType(ExecuteSQL) , New PropertyMetadata("ConnectionString")) Public Shared SQLStatementProperty As DependencyProperty = DependencyProperty.Register("SQLStatement", GetType(String), GetType(ExecuteSQL), New PropertyMetadata("SQL Statement")) Public Shared StatusProperty As DependencyProperty = DependencyProperty.Register("Status", GetType(Boolean), GetType(ExecuteSQL)) Public Shared NewIDProperty As DependencyProperty = DependencyProperty.Register("NewID", GetType(Integer), GetType(ExecuteSQL)) End Class The Status and NewID properties should be read-only because they re return parameters. Create the necessary property statements as follows:

coming from the host pvctoyfan.com and you want to connect to the server using the machine with the hostname pvctoyfan.com as root. You will have to use this command: mysql u root h pvcserver.com.

string[] eventNames = { "Swing Dancing at the South Bank", "Saturday Night Swing", "Formula 1 German Grand Prix", "Swing Dance Picnic", "Stompin' at the 100 Club" };

Look at the variable declaration on the first line. The square brackets after string indicate that eventNames is not just a single string; it s an array of string values. These square brackets tie in with the syntax for accessing individual elements in the array. Example 7-2 prints the first and fifth items in the array. (So this will print out the text Swing Dancing at the South Bank , followed by Stompin at the 100 Club .)

Console.WriteLine(eventNames[0]); Console.WriteLine(eventNames[4]);