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string value = BadExampleErrorHandling.GetStringValue(); if( value != null) { if( value.Length > 0) { Tracer.output( 10, "Not an empty String"); } } Tracer.end( 10); } } In the preceding example, the class BadExampleErrorHandling has two methods: GetArrayValues and GetStringValue. The return value signature for each of the methods is an object. In the first case the object is an array of values, and in the second case the object is a string. The return values from the individual methods are null to indicate that an instance value cannot be returned. In a programming context, null would be correct, because it means that something went wrong in the method and that the caller should take some other action. The problem of returning a null object is that an unknown state is created. A null object doesn t indicate to the caller of the method what went wrong. A null object only indicates something isn t right and the caller needs to figure out the problem. Also problematic is that the caller of the method must add additional error handling to compensate for the problem. The question is, what is the correct value to return When the caller calls a method, it expects an appropriate answer. An appropriate answer is an object instance, and if that isn t possible, then an exception must be raised. Let s say that a caller calls a method and expects an object that contains the configuration of the application as a return answer. If the configuration file or repository cannot be found, would an exception be an appropriate course of action Could another appropriate course of action be defined as a default configuration These questions are examples of error conditions and not exception conditions. asp.net display barcode font ASP . NET Barcode Generator DLL - How to ... - BarcodeLib .com ASP . NET Barcodes Generator Control. How to generate linear & 2d ... LibraryDLL for Barcode Image Generation. Download Barcode for ASP . 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NET is 100% FREE barcode component. public static void TestExamples() { CallTracerStart( SystemReflectionMethodBaseGetCurrentMethod()); CallTracerOutput("Some message in this context"); BetterExamples(); BadExamples(); CallTracerEnd(); } When the code is executed, output similar to the following is generated: start (Chap02SectImplErrorProcessErrorHandlingExamplesTestExamples) Some message in this context start (Chap02SectImplErrorProcessErrorHandlingExamplesBetterExamples) end (Chap02SectImplErrorProcessErrorHandlingExamplesBetterExamples) start (Chap02SectImplErrorProcessErrorHandlingExamplesBadExamples) end (Chap02SectImplErrorProcessErrorHandlingExamplesBadExamples) end (Chap02SectImplErrorProcessErrorHandlingExamplesTestExamples) Looking at the output, there are a number of start and end identifiers Each of the identifiers represents a block of functionality The source code that generates the block is associated with the methods TestExamples, BetterExamples, and BadExamples Based on the nesting, the method TestExamples calls the methods BetterExamples and BadExamples Notice also that when standard text is generated using the method CallTracerOutput, it follows the nested offset of the parent block. crystal reports 9 qr code,data matrix barcode reader c#,code 39 word download,barcode generator in asp.net code project,nuget datamatrix net,create code 128 barcode in excel asp.net barcode font Barcode Generator for ASP . 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For that update a class Tests in chapter16 test application project and add the following using statements at the top to add reference to the ValidationLibrary class library: using ValidationLibrary; If you re unfamiliar with unit testing frameworks, they typically work by examining the metadata on classes and methods to get the necessary cues as to what to do A class that contains test methods is decorated with the TestClass attribute, and individual test methods are decorated with TestMethod, as shown in the following namespace chapter16 { [TestClass] public class Tests : SilverlightTest { [TestMethod] public void TestRangeTooLow() { AssertIsFalse(ValidatorsvalidateRange(0, 10, 20)); } [TestMethod] public void TestRangeAtUpperBound() { AssertIsTrue(ValidatorsvalidateRange(20, 10, 20)); } } } Initially with the previous two tests, the TestRangeTooLow test will succeed and the TestRangeAtUpperBound will fail, which I will explain in details later in this section. 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