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The method MyAssembly encapsulates the external-assembly method call externalMethod within an exception block When the external assembly throws an exception, it s caught, analyzed, and thrown again The problem with throwing an exception from the external assembly is that the application will catch something that s unknown Consider it as follows: you re driving the car, and the carburetor complains that the air mixture contains too little fuel As a driver, you have no idea what s going on, as you might not even know what a carburetor is The driver wants a message that processes the problem of the carburetor into something that the driver can understand You can nest exceptions in NET to address this problem, as illustrated by the following example: public void MyAssembly() { try { externalAssembly.

Hopefully, I ve established so far that managing SQL performance starts with an attitude, a mindset. You accept responsibility for the performance of every statement you write or maintain. You build foundation knowledge about how the optimizer works and use that knowledge to feed the optimizer with quality statistics and quality code. You make your application easy to monitor by adding instrumentation that will help you get the right performance metrics when you need them. The bottom line is that your mindset is geared toward managing performance every day and not just when problems arise.

The XMLRPCObject is the key component of the as3-rpclib library that provides the XML-RPC client functionality. The XMLRPCObject indirectly inherits from mx.rpc.AbstractService, which is the base class for both WebService and RemoteObject.

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externalMethod() } catch( Exception ex) { // test the type of exception and generate a new one throw new Exception( "MyAssembly Exception", ex); } } In the rewritten MyAssembly method, a new exception is instantiated within the catch block When instantiating the Exception type, the constructor has two parameters: "My Assembly Exception" and ex The first parameter is a buffer that indicates an error message that the application can understand The second parameter is the external assembly exception When the new exception is thrown, the old exception is embedded within the new exception The receiver of the new exception reacts to the exception, and processes the embedded exception if necessary However, processing the embedded exception is optional, and provides details about the problem It s a good idea to nest exceptions so that the application can react in a meaningful manner when an exception is generated.

It is critical that the UI update all its references to use the new object returned by Save(). Failure to do this means that the UI will be displaying and editing old data from the old version of the object.

Well, that s all we need on the report design front. Let s add the following code behind Form1.cs to get data and see if we managed to mimic the report: using using using using using using using using using System; System.Collections.Generic; System.ComponentModel; System.Data; System.Drawing; System.Text; System.Windows.Forms; System.Data.SqlClient; Microsoft.Reporting.WinForms;

Referencing the carburetor example, that would mean generating a low-fuel message You can define multiple catch statements to indicate multiple exceptions that can be caught The following example illustrates how to catch multiple exceptions: public void MyAssembly() { try { externalAssemblyexternalMethod() } catch( IOException ex) { // Catch an Input Output Exception throw new Exception( "MyAssembly Exception", ex); } catch( Exception ex) { // Catch all of the other exceptions throw new Exception( "MyAssembly Exception", ex); } }.

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Figure 11-11. Files generated by the O/R Designer In particular, you might want to look at the LeadData.designer.cs class, which contains a class derived from DataContext called LeadDataDataContext. You will use this class to connect to the database and also to commit your updates. This file also contains a class for each table with the same name as the table. For this project, there is only one class, named Lead. This class contains members for each of the columns in the Lead table. If you look at the code, you ll find that there is a lot of extra stuff that LINQ uses to map the class to the table and to provide extensions for you to modify the LINQ functionality. You will not need to modify this file; the default implementation works just fine for our purposes.

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