Application Page, Project Designer (Visual Basic)
Use the Application page of the Project Designer to specify a project's application settings and properties.
To access the Application page, choose a project node (not the Solution node) in Solution Explorer. Then choose Project > Properties on the menu bar. When the Project Designer appears, select the Application tab.
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General application settings
The following options enable you to configure general settings for an application.
Specifies the name of the output file that will contain the assembly manifest. If you change this property, the Output Name property also changes.
You can also specify the name of the output file from a command prompt by using the /out (Visual Basic) compiler switch.
For information about how to access this property programmatically, see AssemblyName.
Specifies the base namespace for all files in the project. For example, if you set the Root Namespace to
Project1 and you have a
Class1 outside of any namespace in your code, its namespace would be
Project1.Class1. If you have a
Class2 in a namespace
Order in code, its namespace would be
If you clear the Root Namespace, you can specify the namespace structure of your project in code.
If you use the
Global keyword in a Namespace Statement, you can define a namespace out of the root namespace of your project. If you clear the Root Namespace,
Global becomes the top-level namespace, which removes the need for the
Global keyword in a
Namespace statement. For more information, see "Global Keyword in Namespace Statements" in Namespaces in Visual Basic.
For information about how to create namespaces in your code, see Namespace Statement.
For more information about the root namespace property, see /rootnamespace.
For information about how to access this property programmatically, see RootNamespace.
Target framework (all configurations)
Specifies the version of the .NET Framework that the application targets. This option can have different values depending on which versions of the .NET Framework are installed on your computer.
The default value matches the target framework that you specified in the New Project dialog box.
The prerequisite packages that are listed in the Prerequisites Dialog Box are set automatically when you open the dialog box for the first time. If you subsequently change the project's target framework, you must specify the prerequisites manually to match the new target framework.
Specifies the type of application to build. The values are different depending on the project type. For example, for a Windows Forms App project, you can specify Windows Forms Application, Class Library, Console Application, Windows Service, or Web Control Library.
For a web application project, you must specify Class Library.
Auto-generate binding redirects
Binding redirects are added to your project if your app or its components reference more than one version of the same assembly. If you want to manually define binding redirects in the project file, deselect Auto-generate binding redirects. This checkbox was introduced in Visual Studio 2017 version 15.7.
For more information about redirection, see Redirecting assembly versions.
Startup form / Startup object / Startup URI
Specifies the application's startup form or entry point.
If Enable application framework is selected (the default), this list is titled Startup form and shows only forms because the application framework supports only startup forms, not objects.
If the project is a WPF Browser Application, this list is titled Startup URI, and the default is Page1.xaml. The Startup URI list enables you to specify the user interface resource (a XAML element) that the application displays when the application starts. For more information, see StartupUri.
If Enable application framework is cleared, this list becomes Startup object and shows both forms and classes or modules with a
Startup object defines the entry point to be called when the application loads. Generally this is set to either the main form in your application or to the
Sub Main procedure that should run when the application starts. Because class libraries do not have an entry point, their only option for this property is (None). For more information, see /main. To access this property programmatically, see StartupObject.
Sets the .ico file that you want to use as your program icon. Select <Browse...> to browse for an existing graphic. See /win32icon (or /win32icon (C# Compiler Options)) for more information. To access this property programmatically, see ApplicationIcon.
Click this button to display the Assembly Information Dialog Box.
Enable application framework
Specifies whether a project will use the application framework. The setting of this option affects the options available in Startup form/Startup object.
If this check box is selected, your application uses the standard
Sub Main. Selecting this check box enables the features in the Windows application framework properties section, and also requires you to select a startup form.
If this check box is cleared, your application uses the custom
Sub Main that you specified in Startup form. In this case you can specify either a startup object (a custom
Sub Main in a method or a class) or a form. Also, the options in the Windows application framework properties section become unavailable.
View Windows Settings
Click this button to generate and open the app.manifest file. Visual Studio uses this file to generate manifest data for the application. Then set the UAC requested execution level by modifying the
<requestedExecutionLevel> tag in app.manifest as follows:
<requestedExecutionLevel level="asInvoker" />
ClickOnce works with a level of
asInvoker or in virtualized mode (no manifest generation). To specify virtualized mode, remove the entire tag from app.manifest.
For more information about manifest generation, see ClickOnce Deployment on Windows Vista.
Windows application framework properties
The following settings are available in the Windows application framework properties section. These options are available only if the Enable application framework check box is selected.
The section following this one describes Windows application framework properties settings specific to Windows Presentation Foundation (WPF) apps.
Enable XP visual styles
Enables or disables the Windows XP visual styles, also known as Windows XP Themes. Windows XP visual styles enable, for example, controls with rounded corners and dynamic colors. The default is enabled.
Make single instance application
Select this check box to prevent users from running multiple instances of the application. The default setting for this check box is cleared, which allows multiple instances of the application to be run. For more information, see the StartupNextInstance event.
Save My.Settings on Shutdown
Select this check box to specify that the application's
My.Settings settings are saved when users shut down their computers. The default setting is enabled. If this option is disabled, you can save application settings manually by calling
Select Windows (the default) to specify the use of Windows authentication to identify the currently logged-on user. You can retrieve this information at run time by using the
My.User object. Select Application-defined if you will provide your own code to authenticate users instead of using the default Windows authentication methods.
Select When startup form closes (the default) to specify that the application exit when the form set as the startup form closes, even if other forms are open. Select When last form closes to specify that the application exit when the last form is closed or when
My.Application.Exit or the
End statement is called explicitly.
Select On explicit shutdown to specify that the application exit when you explicitly call
Select On last window close to specify that the application exit when the last window closes or when you explicitly call
Shutdown. This is the default setting.
Select On main window close to specify that the application exit when the main window closes or when you explicitly call
Select the form that you want to use as a splash screen. You must have previously created a splash screen by using a form or a template. The default is (None).
View Application Events
Click this button to display an events code file in which you can write events for the application framework events
NetworkAvailabilityChanged. You can also override certain application framework methods. For example, you can change the display behavior of the splash screen by overriding
Windows application framework properties for Windows Presentation Foundation (WPF) apps
The following settings are available in the Windows application framework properties section when the project is a Windows Presentation Foundation (WPF) app. These options are available only if the Enable application framework check box is selected. The options listed in this table are available only for WPF or WPF browser applications. They are not available for WPF User Control or Custom Control libraries.
This property is applicable only to Windows Presentation Foundation (WPF) applications.
Select On explicit shutdown to specify that the application exit when you explicitly call Shutdown.
Select On last window close to specify that the application exit when the last window closes or when you explicitly call Shutdown. This is the default setting.
Select On main window close to specify that the application exit when the main window closes or when you explicitly call Shutdown.
For more information about using this setting, see Shutdown
This button opens the application definition file (Application.xaml) in the XAML editor. When you click this button, Application.xaml opens at the application definition node. You might have to edit this file to perform certain tasks, such as defining resources. If the application definition file does not exist, the Project Designer creates one.
View Application Events
This button opens the
Application class file (Application.xaml.vb) in a code editor. If the file does not exist, the Project Designer creates one with the appropriate class name and namespace.
The Application object raises events when certain application state changes occur (for example, on application startup or shutdown). For a full list of the events that this class exposes, see Application. These events are handled in the user code section of the
Application partial class.
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