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If you are creating an application that should never allow silent overflow to occur, you may find yourself in the annoying position of wrapping numerous lines of code within the scope of the checked keyword. As an alternative, the C# compiler supports the /checked flag. When enabled, all of your arithmetic will be evaluated for overflow without the need to make use of the C# checked keyword. If overflow has been discovered, you will still receive a runtime exception. To enable this flag using Visual Studio 2010, open your project s property page and click the Advanced button on the Build tab. From the resulting dialog box, select the Check for arithmetic overflow/underflow check box (see Figure 3-16).

Figure 3-16. Enabling project-wide overflow/underflow data checking Enabling this setting can be very helpful when you re creating a debug build. Once all of the overflow exceptions have been squashed out of the code base, you re free to disable the /checked flag for subsequent builds (which will increase the runtime performance of your application).

The submit element is used to submit the form. The word displayed inside the button defaults to Submit but can be changed using the #value property: $form['submit'] = array( '#type' => 'submit', '#value' => t('Continue'), ); Properties commonly used with the submit element are #attributes, #button_type (the default is submit ), #executes_submit_callback (the default is TRUE), #name (the default is op ), #prefix, #suffix, #value, #process (the default is array('ajax_process_form')), and #weight. Additionally, the #validate and #submit properties may be assigned directly to the submit element. For example, if #submit is set to array('my_special_form_submit'), the function my_special_form_submit() will be used instead of the form s defined submit handler(s).

Now, assuming you have enabled this project-wide setting, what are you to do if you have a block of code where data loss is acceptable Given that the /checked flag will evaluate all arithmetic logic, C# provides the unchecked keyword to disable the throwing of an overflow exception on a case-by-case basis. This keyword s use is identical to that of the checked keyword in that you can specify a single statement or a block of statements. // Assuming /checked is enabled, // this block will not trigger // a runtime exception. unchecked { byte sum = (byte)(b1 + b2); Console.WriteLine("sum = {0} ", sum); } So, to summarize the C# checked and unchecked keywords, remember that the default behavior of the .NET runtime is to ignore arithmetic overflow/underflow. When you want to selectively handle discrete statements, make use of the checked keyword. If you wish to trap overflow errors throughout your application, enable the /checked flag. Finally, the unchecked keyword may be used if you have a block of code where overflow is acceptable (and thus should not trigger a runtime exception).

To wrap up the topic of data type conversions, I d like to point out the fact that the System namespace defines a class named Convert that can also be used to widen or narrow data. static void NarrowWithConvert() { byte myByte = 0; int myInt = 200; myByte = Convert.ToByte(myInt); Console.WriteLine("Value of myByte: {0}", myByte); } One benefit of using System.Convert is that it provides a language-neutral manner to convert between data types (for example, the Visual Basic language syntax for casting is completely different from the C# language syntax). However, given that C# provides an explicit conversion operator, using the Convert type to do your data type conversions is usually nothing more than a matter of personal preference.

The button element is the same as the submit element except that the #executes_submit_callback property defaults to FALSE. This property tells Drupal whether to process the form (when TRUE) or simply re-render the form (if FALSE). Like the Submit button, specific validation and submit functions can be assigned directly to a button.