For example, the App_Code folder cannot include source code in both Visual Basic and C#. Multiple Programming Languages in the App_Code Folderīecause the source code in the App_Code folder is compiled into a single assembly, all the files in the App_Code folder must be in the same programming language. wsdl file, ASP.NET uses the default compiler for Web applications, as established in the compilation element of the Web application or machine configuration file. If the App_Code folder contains only files where the programming language is ambiguous, such as a. cs files, ASP.NET uses the C# compiler, and so on. vb files, ASP.NET uses the Visual Basic compiler if it contains. Instead, the ASP.NET infers which compiler to invoke for the App_Code folder based on the files it contains. The App_Code folder is not explicitly marked as containing files written in any one programming language. Inferring the Programming Language of the App_Code Folder Note that user controls do not need to be in the App_Code folder they are already available to pages anywhere in the application. in the App_Code directory causes the user control's code to be compiled out of its required sequence and therefore is not allowed. This includes both single-file user controls and user controls that use the code-behind model. User controls are not allowed in the App_Code folder. You can organize your source code in any way that you find convenient, and ASP.NET will still compile all of the code into a single assembly that is accessible to other code anywhere in the Web application. The App_Code folder can contain as many files and subfolders as you need. ASP.NET can compile these files into assemblies. wsdl (Web service description language) files and XML schema (.xsd) files. However, it can also include files that are not explicitly in a specific programming language. The App_Code folder can contain source code files written as traditional class files - that is, files with a. The App_Code folder and its special status in an ASP.NET Web application makes it possible to create custom classes and other source-code-only files and use them in your Web application without having to compile them independently. The App_Code folder therefore works much like the Bin folder, except that you can store source code in it instead of compiled code. The resulting assembly is accessible to any other code in the Web application. You can store source code in the App_Code folder, and it will be automatically compiled at run time. For example, the code might be running with full trust. If you are working in a designer such as Visual Studio, code in the Bin folder runs in a different context than at run time. For more information, see ASP.NET Trust Levels and Policy Files. Therefore, they cannot access resources or invoke code outside the current Web application.Īt run time, the access levels of an assembly are established by the trust level specified on the local computer. Note these security aspects of putting compiled code into the Bin folder:Īssemblies in Bin folder are scoped to the current application. Be wary of compiled code until you have tested it and are confident that you understand what it does. However, you should treat compiled code in the Bin folder as you would treat any executable code. If you wrote the code yourself and compiled it, then you know what the code does. Putting compiled assemblies into the Bin folder can represent a security risk. For information about why you should not do this in ASP.NET 1.0 or ASP.NET 1.1, see the KnowledgeBase article "Access Denied" Error Messages on the Microsoft support Web site. In ASP.NET 2.0 and later versions, you can put strong-named (signed) assemblies in the Bin folder. dll and write a new version of it to the Bin folder, ASP.NET detects the update and uses the new version of the. dll file in the Bin folder is sufficient for ASP.NET to recognize it. You can copy the compiled assembly to the Bin folder of your Web application and the class is then available to all pages.Īssemblies in the Bin folder do not need to be registered. A typical example is that you have the compiled code for a custom class. You can store compiled assemblies in the Bin folder, and other code anywhere in the Web application (such as code for pages) automatically references it. For information about how these folders work in Web application projects, see App_Code folder doesn't work with Web Application Projects on Vishal Joshi's blog. When you create these folders and store particular types of files in them, ASP.NET handles the files in special ways. If your Web site application includes code that you want to share between pages, you can keep the code in one of two special folders underneath the root of your Web application, the Bin folder and the App_Code folder.
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