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When you modify one of the value-type fields in one of the values, the other value is unaffected. But if you modify the object that is referred to by the reference-type field, then the change will be reflected through the reference to the same object contained in the second struct value. The following statements demonstrate this: using System; using System.Text; class Listing 21 Test { static void Main(string[] args) { // create a StringBuilder object StringBuilder sb = new StringBuilder("BigCo Supplies"); // create a struct value Product prod = new Product(20, 20, sb); // create a copy of the struct value Product prod2 = prod; // make a change to a value-type field in the original struct value prod.ItemsPerCase = 30; // write out both copies of the same field Console.WriteLine("Original Value ItemsPerCase: {0}", prod.ItemsPerCase); Console.WriteLine("Copy Value ItemsPerCase: {0}", prod2.ItemsPerCase); // make a change to the reference-type field in the original struct value prod.SupplierName.Append(" Inc"); // print out both values for the reference-type field Console.WriteLine("Original Value Supplier: {0}", prod.SupplierName); Console.WriteLine("Copy Value Supplier: {0}", prod2.SupplierName); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } These statements create a value from the struct in Listing 12-21 and assign a copy to another local variable. A change is made to both a value-type field and the reference-type field, and the values of those fields in both struct values are printed out. Compiling and running the code produces the following results: Original Value ItemsPerCase: 30 Copy Value ItemsPerCase: 20 Original Value Supplier: BigCo Supplies Inc Copy Value Supplier: BigCo Supplies Inc

This code produces the following output: Jon Peter Beth Julia Tammi Other important things to know about Main are the following: Main must always be declared static. Main can be declared in either a class or a struct. A program can contain only one declaration of the four acceptable entry point forms of Main. You can, however, legally declare other methods named Main, as long as they don t have any of the four forms listed previously but doing this is inviting confusion.

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Languages like C# 20 and VB NET 20 have only limited support for exceptions that do not derive from System::Exception, and earlier versions of these languages do not support other exception types at all The text file dumper application shown before will run successfully only if all commandline arguments are paths to files that are not locked by other processes and are accessible for the current user In theory, it is even possible that the application is able to write to the console As an example, assume you have piped the console output to a file and your hard disk is running out of space, or you have reached your quota on the hard disk In all these error cases, the FCL types used by the application will throw managed exceptions The preceding code does not handle managed exceptions so far.

The Fetch() method follows the same basic flow as Create(). The primary difference is in how the business object is created. Where Create() is passed the type of the business object as a parameter, Fetch() calls a CreateBusinessObject() helper method: obj = CreateBusinessObject(criteria); This helper method examines the criteria object to determine the type of business object to be created: private static object CreateBusinessObject(object criteria) { Type businessType; if (criteria.GetType().IsSubclassOf(typeof(CriteriaBase))) { // get the type of the actual business object // from CriteriaBase (using the new scheme) businessType = ((CriteriaBase)criteria).ObjectType; } else

The default behavior for unhandled exceptions is to write an error message describing the exception to the console s error stream and to create an entry in the operating system s event log (If you are interested in overriding this behavior, consult the documentation for AppDomain::UnhandledException) StreamReader s constructor can throw exceptions of type System::IO::FileNotFoundException^, System::IO::PathNotFoundException^, and System::IOException^ An IOException^ can also be thrown from the stream writer Console::Out Figure 3-5 shows the inheritance tree for these exception classes..

Getting the correct Resource object is easy, because the ProjectResource object implements a GetResource() method. When the user clicks the hyperlink, the code gets the selected ResourceId value from the DataGridView control and passes that value to the ShowEditResource() method on MainForm: Private Sub ResourcesDataGridView_CellContentClick( _ ByVal sender As System.Object, _ ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) _ Handles ResourcesDataGridView.CellContentClick If e.ColumnIndex = 1 And e.RowIndex > -1 Then Dim resourceId As Integer = _ CInt(Me.ResourcesDataGridView.Rows(e.RowIndex).Cells(0).Value) MainForm.ShowEditResource(resourceId) End If End Sub

<Grid.ColumnDefinitions> <ColumnDefinition Width="0.24*"/> <ColumnDefinition Width="0.76*"/> </Grid.ColumnDefinitions> Notice that the Columns and Rows have Height and Width values. If you hard-code the Height and Width values, it means that your Grid cannot scale to accommodate for content placed inside it. For this reason, it is good practice to not hard-code these values, and instead take full advantage of the way Silverlight s powerful layout engine can position objects automatically. Blend has placed Height and Width values in for you because your Grid is in Canvas Layout mode as opposed to Grid Layout mode. The Blend team created Canvas Layout mode to make it easier for designers not experienced with layout panels to get started. Fortunately for you, you are getting started with me, and I am going to teach you about the slightly more complex Grid Layout mode. At the very top left of the Grid, you can see a little button that if clicked will change the Grid s mode to Grid Layout mode, as shown in Figure 4-4.

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