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How It Works The FriendsReunionException class will serve as the base class for any custom exceptions you define for the application. Having such a class will allow you to write a generic Catch block to catch any custom exception type defined by your application (and thus differentiate them from exceptions thrown by the .NET Framework). It inherits from the .NET Framework class called ApplicationException, a generic exception thrown when a nonfatal application error occurs, which itself inherits from the more generic Exception class. The DuplicateUsernameException class is an application-specific exception class that you ll use to handle errors caused when a user tries to register using a user name that already exists in the database. It inherits from the FriendsReunionException class you just created. Each of these classes contains two constructors. The more interesting one in each case is the one that contains two arguments. Its purpose will become clear in the next example. You ve used Microsoft s recommendation by appending the word Exception to each of your exception classes, and by deriving them from the ApplicationException class. Now it s time to see these classes in action.

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eport templates are standard in reporting applications. They define the layout of the documents that the report-filling process produces. Like other reporting engines, JasperReports uses report templates structured in multiple sections. Each section type has its own characteristics and behavior. Section types include title, summary, page and column headers and footers, group headers and footers, and details. Each section is made of individual elements like lines, rectangles, static and dynamic text fields, images, and charts. Creating a report template is a two-phase process because of how JasperReports evaluates report expressions, also known as formulas. The phases are as follows: 1. The initial report templates are compiled into a more digestible form before being filled with data. 2. Various consistency checks are performed and information for evaluating expressions at runtime is added.

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owner (4) * object_type (7) / 1.4142 owner (3) * object_type (7) / 1.4142 t1 value + t2 value least (t1 value, t2 value) First (i.e., t1) value

When handling an exception within a Catch block, it is sometimes useful to be able to perform a few important handling tasks within that Catch block and then rethrow the exception so that it may be caught and handled by a different Catch block (which then performs its own exception-handling tasks). It can even be advantageous to catch one type of exception, perform your handling tasks, and then rethrow it as a different type of exception usually a more specific one that will provide additional information about the type of exception being thrown.

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You have to be a little careful with the assumptions you make about how the SQL will be operated It is possible for things to change, and it may well have been true that in 80 or 73 the presence of the apparently redundant distinct would have resulted in an extra pair of sorts taking place Things do change, and bugs can appear If you look in the 10053 trace, by the way, you won t find any information about the set operation itself there will be a section for each of the two separate queries, followed by a final cost that represents the set operation But there is no explanation or justification for the final figures So you can only assume, as I do, that the optimizer just adds the cost of the separate queries to get the final cost of the set operation.

Custom (application-specific) exception types can have a big part to play in this. You may catch a generic exception, identify how it relates to the application, and then rethrow it as an application-specific exception so that it can be handled appropriately. Try It Out: Rethrow Exceptions Let s see how this works with a custom exception type. 1. Modify the exception-handling code of the InsertUser() method in NewUser.aspx.vb as follows: Try cmd.ExecuteNonQuery() Catch ex As SqlException If ex.Number = 2627 Then Throw New DuplicateUsernameException("Can't insert record", ex) Else doredirect = False Me.lblMessage.Visible = True Me.lblMessage.Text = "Insert couldn't be performed. " End If Catch ex As OutOfMemoryException ... 2. Add the following code to the btnAccept_Click() method, in the same file: Private Sub btnAccept_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles btnAccept.Click If Page.IsValid Then Trace.Write("FriendsReunion", "Page data was validated ok") If Context.User.Identity.IsAuthenticated Then UpdateUser() Else Try InsertUser() Catch ex As DuplicateUsernameException lblMessage.Visible = True lblMessage.Text = _ "You are trying to register using a user name that has " + _ "already been taken by someone else. " + _ "Please choose a different user name. " End Try End If Else lblMessage.Text = "Fix the following errors and retry:" End If End Sub

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