Windows Forms in Action, Second Edition of Windows Forms

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Extra resources for Windows Forms in Action, Second Edition of Windows Forms Programming with C-Sharp; Erik Brown

Example text

Note the use of the new keyword to initialize both controls. Each control is then assigned an appropriate appearance and location. You might think that members such as Text, Left, BorderStyle, and so on are all public fields in the Button and PictureBox classes, but this is not the case. Public member variables in C++, as well as in C#, can be a dangerous thing, as these members can be manipulated directly by programmers without restrictions. —set such a variable to an invalid value and cause a program error.

If the tabletop is the form, and a cup and saucer are controls, in your code you would first add the cup control to the table, then add the saucer control so that it appears underneath the cup. This can be a bit nonintuitive, so make sure you understand this point when programmatically adding controls to your forms. The term z-order comes from the fact that the screen is two-dimensional, and is often treated as a two-axis coordinate system in the X and Y directions. The imaginary axis perpendicular to the screen is called the z-axis.

This is much like an object reference in C++, or a pointer in C, except that in C# the reference is implicit. All classes in C# are reference types, as are the built-in object and string types. When a value type is passed into a method as an object instance, the compiler automatically converts the value type into a reference type as required, using a process called boxing. 2. The variable x is a value type and contains the integer 54. The variable s is a reference type, and points to the string “Fifty-Four” somewhere else in memory.

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