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static void MethodTwo() { try { Console.WriteLine("Start of MethodTwo"); MethodThree(); // print out a message - this statement will not // be reached because the previous statement calls // a method that throws an exception Console.WriteLine("End of MethodTwo"); } catch (ArgumentOutOfRangeException ex) { // handle this kind of exception } } static void MethodThree() { Console.WriteLine("Start of MethodThree"); // define a loval variable string myLocalVar = null; // try to so something with the local variable Console.WriteLine("First letter: {0}", myLocalVar[0]); // print out a message - this statement will not // be reached because the previous statement will // throw an exception Console.WriteLine("End of MethodThree"); } } The sequence of method calls in Listing 14-3 is shown in Figure 14-2. I have made all the methods in this example static for simplicity. The Main method calls MethodOne, which calls MethodTwo, which calls MethodThree. vb net gs1 128 VB . NET GS1 -Compatible Barcode Generator - Generate GS1 ...
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Easy to generate GS1 - 128 with Visual Basic . NET in .NET framework applications. Figure 14-2. Call stack for Listing 14-3 The sequence of method calls is called the call stack. In the listing, the exception is thrown in MethodThree (this is the same exception we saw previously), which is an instance of System.NullReferenceException. When the exception is thrown, the search for a handler begins. First, the runtime looks at the statement in MethodThree that caused the exception and checks to see whether it is enclosed by a try statement. In this example, it is not. Next, the runtime looks at the statement that called MethodThree. This is contained in MethodTwo. You can see that we are moving back up the call stack. The call in MethodTwo is enclosed in a try statement, so the runtime looks at the catch clause to see whether it can handle a NullReferenceException. It .net gs1 128 VB . NET GS1 128 (EAN 128) Generator generate, create barcode ...
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Generate GS1 - 128 /EAN-128/UCC-128 in VB . NET application with barcode generator for Terrek.com. doesn t the catch clause in MethodTwo is only able to handle an ArgumentOutOfRangeException, so the search continues. The runtime moves up the stack again to MethodOne and checks to see whether the statement that called MethodTwo is enclosed in a try statement. No luck there. The runtime moves up the call stack again, this time to the Main method. The statement that invoked MethodOne is enclosed in a try statement, and this time, there is a catch clause that can handle a NullReferenceException. The runtime executes the statements in the catch clause. In this example, a single statement prints out the value of the Message property. Compiling and running the code in Listing 14-3 produces the following results: Start of MethodOne Start of MethodTwo Start of MethodThree Exception: Object reference not set to an instance of an object. Press enter to finish Execution of the program continues from the next statement after the catch clause that has handled the exception. You can see from the output that the statements that print out a message at the end of each method are not performed, but the statements that follow the try statement in the Main method are, starting with this one: Console.WriteLine("Press enter to finish"); Caution When I installed the javadoc, the install complete window would hide in the background and Understanding which statements are executed when an exception occurs and has been handled is essential to using exceptions effectively, as well as understanding how the runtime searches for a handler to process the exception. Direct mail Sent Cost for each Promotion cost Response rate Responses Average sale Pro t per sale Pro t from newsletter Net pro t Twelve per year Annual pro t per name 200,000 $0.50 $100,000 2.00% 4,000 $100.00 $40.00 $160,000 $60,000 $240,000 $1.20 Email 200,000 $0.04 $8000 1.50% 3,000 $100.00 $40.00 $120,000 $112,000 $448,000 $2.24 A try statement can have more than one catch clause, and each catch clause can handle a different kind of exception. Listing 14-4 contains an example. Listing 14-4. catch Clauses in a try Statement try { // statements likely to cause exceptions } catch (NullReferenceException ex) { // code which handles a NullReferenceException } catch (ArgumentOutOfRangeException ex) { // code which handles an ArgumentOutOfRangeException } catch { // code which handles all exception types not handled // in the clauses above gs1-128 .net Code 128 Barcode generation in vb . net - Stack Overflow
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