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1 The first two box instructions occur in the initial calls to listAdd() The signature for the ArrayList method is int Add(object value) As such, any value type passed to this method is boxed 2 Next are two unbox instructions in the call to Add() within the for loop The return from an ArrayList's index operator is always object because that is what ArrayList collects In order to add the two values, however, you need to cast them back to doubles This cast back from an object to a value type is an unbox call 3 Now you take the result of the addition and place it into the ArrayList instance, which again results in a box operation Note that the first two unbox instructions and this box instruction occur within a loop 4 In the foreach loop, you iterate through each item in ArrayList and assign them to count However, as you already saw, the items within ArrayList are objects, so assigning them to a double is unboxing each of them 5 The signature for ConsoleWriteLine() that is called within the foreach loop is void ConsoleWrite(string format, object arg) As a result, each call to it invokes a box operation back from double and into object Obviously, you can easily improve this code by eliminating many of the boxing operations Using an object rather than double in the last foreach loop is one improvement you can make Another would be to change the ArrayList data type to one that supports a concept known as generics (see 12) The point, however, is that boxing can be rather subtle, so developers need to pay special attention and notice situations where it could potentially occur repeatedly and affect performance There is another unfortunate runtime-boxing-related problem If you wanted to change the initial two Add() calls so that they did not use a cast (or a double literal), you would have to insert integers into the array list Since int s will implicitly cast to doubles, this would appear to be an innocuous modification However, the casts to double from within the for loop, and again in the assignment to count in the foreach loops, would fail The problem is that immediately following the unbox operation is an attempt to perform a memory copy of the int into a double You cannot do this without first casting to an int , because the code will throw an InvalidCastException at execution time Listing 86 shows a similar error commented out. crystal report barcode font free download Crystal Reports Barcode Font Encoder Free Download Crystal Reports Barcode Font Encoder UFL - Create barcodes in SAP Crystal Reports with this UFL for 32 and 64 bit machines, which supports all popular ... barcode font for crystal report free download Code 128 Barcodes created with Crystal UFL or Windows DLL not ... 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