By Michael Stiefel
This publication supplies skilled builders perception had to construct firm functions for Microsoft's .NET platform utilizing C#. wide code examples and a working case learn illustrate .NET recommendations and applied sciences. After an overview of the programming version of the .NET framework, assurance comprises the C# programming language, primary subject matters within the .NET framework reminiscent of home windows kinds periods and ADO.NET, net programming utilizing ASP.NET and cleaning soap, and extra subject matters within the .NET Framework together with safety and interoperability. Stiefel is a expert focusing on Microsoft know-how; Oberg is founding father of a company that develops courseware on software program applied sciences.
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Additional resources for Application Development Using C# and .NET
58 59 A language such as Smalltalk also has such a feature but pays the price of inefficiency for simple types. Languages such as C++ and Java treat simple built-in types differently from objects, thus obtaining efficiency but at the cost of a unified type system. C# enjoys the best of both worlds through a process known as boxing. Boxing converts a value type such as int or a struct to an object reference and is done implicitly. Unboxing converts a boxed value type (stored on the heap) back to an unboxed simple value (stored on the stack).
By default, the first enum member is assigned the value 0, the second member 1, and so on. Constant values can be explicitly assigned. , BookingStatus). You can refer to the enumerated values by using the dot notation. WriteLine("Hotel not found"); ... Reference Types A variable of a reference type does not directly contain its data but instead provides a reference to the data stored in the heap. In C# there are the following kinds of reference types: • Class • Array • Interface • Delegate Reference types have a special value null, which indicates the absence of an instance.
The Main method must always be static. You call a static method by using the dot notation, with the class name in front of the dot. Because you must call a static method without an instance, a static method can use only static data members and not instance data members. Static methods may be declared public or private. A private static method, like other private methods, may be used as a helper function within a class, but not called from outside. Sample Program Our previous Customer class relied on the user of the class to assign a CustomerId for the customer.