#Blocs app structure code

Procedures, operators, properties, and events are the only programming elements that can hold executable code (statements that perform actions at run time). For more information on the module-level elements, see the following:Дata elements at namespace level are enumerations and delegates. Interfaces, which define element signatures but provide no implementation, also appear at module level. They hold the declarations of all other programming elements. They are namespace-level elements, which can appear within a namespace or at the source file level. Namespace-Level Programming ElementsД¬lasses, structures, and modules contain all the code in your source file.

For more information, see Conditional Compilation. You can also use them for debugging your application, because conditional code runs in debugging mode only. They cause parts of your code to be included or excluded at compile time depending on certain conditions. Conditional Compilation StatementsД¬onditional compilation statements can appear almost anywhere in your source file. For more information, see Namespaces in Visual Basic. You use the Namespace Statement to classify the following statements within a particular namespace. Namespaces help you organize and classify your programming elements for ease of grouping and accessing. For more information, see References and the Imports Statement. You can use as many Imports statements as appropriate. An Imports statement allows your code to refer to classes and other types defined within the imported namespace, without having to qualify them. You can include an Imports Statement (.NET Namespace and Type) to import names defined outside your project. The Option Compare Statement specifies the way strings are compared to each other, based on either their Binary or Text values. The Option Strict Statement helps to minimize logic errors and data loss that can occur when you work between variables of different data types. The Option Explicit Statement ensures that all variables are declared and spelled correctly, which reduces debugging time. Option statements establish ground rules for subsequent code, helping prevent syntax and logic errors. You can intersperse these in the source file among the statements of the preceding sequence.

If you enter statements in a different order, compilation errors can result.ДЄ program can also contain conditional compilation statements. Namespace statements and namespace-level elements Any code that you write should follow the following sequence: When you start a project or file and open the code editor, you see some code already in place and in the correct order.

A source file provides the definition and implementation of classes, structures, modules, and interfaces, which ultimately contain all your code.ДЇor more information about these building blocks of a Visual Basic program, see Solutions and Projects and Assemblies in. Each assembly is compiled from one or more source files. A project in turn can contain one or more assemblies. A solution comprises one or more projects. A Visual Basic program is built up from standard building blocks.