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The const modifier is used to declare fields or local variables that cannot be changed These variables must be given initial values when they are declared Thus, a const variable is essentially a constant For example,

exceptions are implemented as classes. Almost all exceptions inherit from the System.Exception class.

const int i = 10;

creates a const variable called i that has the value 10 Although a const field is similar to a readonly field, the two are not the same A const field cannot be set within a constructor, but a readonly field can The volatile modifier tells the compiler that a field s value may be changed by two or more concurrently executing threads In this situation, one thread may not know when the field has been changed by another thread This is important because the C# compiler will automatically perform certain optimizations that work only when a field is accessed by a single thread of execution To prevent these optimizations from being applied to a shared field, declare it volatile This tells the compiler that it must obtain the value of this field each time it is accessed

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Keepdynamic.com provides Code - 39 C# .NET Barcode Generator Library for the creation/generation of Code 39 barcodes in your C# .NET framework projects. Code 39 is an alphanumeric, discrete, and variable-length barcode symbology. In code 39 barcode image symbol, a fixed pattern of bars represents a character.

One problem with exceptions in other languages is that they are expensive to support. Modern languages like Java and C# have done away with this problem by designing exceptions into the language so that compilers can handle them cheaply and gracefully. The format used to process exceptions is the well-known try-catch blocks used in distributed computing interfaces and C++ development environments for many years. A portion of code where exceptions may be caught is enclosed in a try block, and the portion of code that handles an exception is enclosed in a catch block. We will discuss this syntax in more detail in a moment. First, let s add such a block to the code where we create the Bitmap object. Here is our existing code:

TE Lipman, MA Delucchi, A retail and lifecycle cost analysis of hybrid electric vehicles, Transportation Research Part D, Elsevier, 2001 KT Ulrich, Estimating the technology frontier for personal electric vehicles, Transportation Research Part C, Elsevier, 2003 Gale Reference Team, NY Transportation Plan to Support Electric Vehicle Projects, Electric and Hybrid Vehicles Today, 2005 Lee Zion, Ford pulls the plug on its think line of electric cars, San Diego Business Journal, published by CBJ, LP on September 9, 2002 The Associated Press, After Bike-Sharing Success, Paris Considers Electric Cars, July, 29, 2008 Steven Erlanger, Israel Is Set to Promote the Use of Electric Cars, NY Times, January 21, 2008 Richard S Chang, You Built an Electric Car Out of a DeLorean , NY Times, June 11, 2008 Nick Bunkley, Nissan Says Electric Cars Will Be Quickly Profitable, NY Times, July 23, 2008

In addition to the using directive discussed earlier, using has a second form that is called the using statement It has these general forms: using (obj) { // use obj } using (type obj = initializer) { // use obj }

if (dlg.ShowDialog() == DialogResult.OK) { imgPhoto.Image = new Bitmap(dlg.OpenFile()); }

Part I:

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