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What are Application Pages in SharePoint?

Posted By :Gowthammanju     Posted Date :October 31, 2011    Points :40   Category :SharePoint 

Ans. Unlike site pages (for example, default.aspx), a custom application page is deployed once per Web server and cannot be customized on a site-by-site basis. Application pages are based in the virtual _layouts directory. In addition, they are compiled into a single assembly DLL.
A good example of an Application Page is the default Site Settings page: every site has one, and it's not customizable on a per site basis (although the contents can be different for sites).
With application pages, you can also add inline code. With site pages, you cannot add inline code.

You can also find related Interview Question to What are Application Pages in SharePoint?  below: 


Q. What are Application Pages in SharePoint?

  

Ans : Unlike site pages (for example, default.aspx), a custom application page is deployed once per Web server and cannot be customized on a site-by-site basis. Application pages are based in the virtual _layouts directory. In addition, they are compiled into a single assembly DLL.A good example of an Application Page is the default Site Settings page: every site has one, and it's not customizable on a per site basis (although the contents can be different for sites). With application pages, you can also add inline code. With site pages, you cannot add inline code.

Typically, you link custom application pages to application.master, the master page file that is used by the default application pages in Windows SharePoint Services. You should also write application pages to inherit from a base class defined inside the Microsoft.SharePoint assembly named LayoutsPageBase.


(More...)

Q. Can we use our custom master page with the application pages in SharePoint 2010 ?

  

Ans. With 2010, you can now set whether the pages under _Layouts use the same Master Page as the rest of your site. You can enable or disable this functionality through the web application settings in Central Administration. This however, is not applicable to your custom application pages. If you want your custom applictaion page to inherit the site master page you must derive it from Microsoft.SharePoint.WebControls.LayoutsPageBase class.
(More...)

Q. Can we use our custom master page with the application pages in SharePoint 2010 ?

  
Ans. With 2010, you can now set whether the pages under _Layouts use the same Master Page as the rest of your site. You can enable or disable this functionality through the web application settings in Central Administration. This however, is not applicable to your custom application pages. If you want your custom applictaion page to inherit the site master page you must derive it from Microsoft.SharePoint.WebControls.LayoutsPageBase class.

(More...)

What are Application Pages in SharePoint?

  
Unlike site pages (for example, default.aspx), a custom application page is deployed once per Web server and cannot be customized on a site-by-site basis. Application pages are based in the virtual _layouts directory. In addition, they are compiled into a single assembly DLL.
A good example of an Application Page is the default Site Settings page: every site has one, and it's not customizable on a per site basis (although the contents can be different for sites).
With application pages, you can also add inline code. With site pages, you cannot add inline code. (More...)

Can I add more than one .xaml pages in silverlight application?

  
Yes, you can have multiple .xaml files in a single project.

In the App.xaml, in the method Application_Startup you can choose, which page you want to

initially display. (More...)

Which are default master pages in Sharepoint 2010?

  
1. v4.master - This is default master page.
2. default.master - this is used to support the 2007 user interface
3. minimal.master
4. simple.master- it is used for accessdenied.aspx, confirmation.aspx, error.aspx, login.aspx, reqacc.aspx, signout.aspx & webdeleted.aspx pages. (More...)

How would you pass user credentials while using SharePoint WebService from your Web Part or application.

  
Ans. The web service needs credentials to be set before making calls.

Examples:

listService.UseDefaultCredentials = true; // use currently logged on user

listService.Credentials = new System.Net.NetworkCredential("user", "pass", "domain"); // use specified user (More...)

What are Application Pages, Site Pages and Content Pages?

  
Application Pages - An application page is deployed once per Web server and cannot be customized on a site-by-site basis. They stay in 12 hive folder structure, mostly under layouts folder.

Site Pages - These are pages that make up the site interface and are specific to one site or site collection.They mostly get stored in the content database of the site collection.

Content Pages - Site Page which contains webpart or other custom components. This Page is stored in database. They mostly get stored in the content database of the site collection. (More...)

Which points we need to consider while migrating SharePoint application from 2007 to 2010?

  
While migrating SharePoint application from 2007 to 2010, we need to consider or look at or check the following points:
1) Absolute Classes and Namespaces - Because the changes in the API in the upgrades are backward compatible, we don't have to make any changes to 2007 custom solutions before we redeploy them to the 2010 version of the SharePoint.
Some classes and namespaces are absolute but they will continue to work as expected.We need to recompile our code. The compiler warning will tell us which elements of the object model are absolute and which newer alternatives we should use.

2) Event Handler - We need to recompile and redeploy it.

3) Master Page and Themes - SharePoint 2007 themes no longer exist in SharePoint 2010 so any customization and design work that we have done with themes will not be imported into the new version.

4) Scripts - Scripts should work with 2010, but we should check to determine whether they are relevant to the new changes.

5) 32 bit DLLs - DLLs that support 32 bit application will no longer be supported in SharePoint 2010 as it is designed to work in 64 bit. (More...)

What are ghosted pages in SharePoint 2010?

  
Those pages which are not stored in the content database are ghosted pages .These pages resides inside the server's file system. These reference files are common for the site collections and Web applications within the SharePoint server. If user modifies a reference file then that change will reflect in all the site collection within that SharePoint server automatically (More...)

In what scenarios we can use Application Pages?

  
We can use/ create application pages in following scenarios -
1) To restrict the user to customize the page

2) To capture data

3) When we want to add custom code or inline code to that page

4) For administrative or configuration pages
(More...)

What is Application Domain?

  
The primary purpose of the AppDomain is to isolate an application from other applications. Win32 processes provide isolation by having distinct memory address spaces. This is effective, but it is expensive and doesn't scale well. The .NET runtime enforces AppDomain isolation by keeping control over the use of memory - all memory in the AppDomain is managed by the .NET runtime, so the runtime can ensure that AppDomains do not access each other's memory.
Objects in different application domains communicate either by transporting copies of objects across application domain boundaries, or by using a proxy to exchange messages.
MarshalByRefObject is the base class for objects that communicate across application domain boundaries by exchanging messages using a proxy. Objects that do not inherit from MarshalByRefObject are implicitly marshal by value. When a remote application references a marshal by value object, a copy of the object is passed across application domain boundaries. (More...)

I have written an assembly that I want to use in more than one application. Where do I deploy it?

  
Assemblies that are to be used by multiple applications (for example, shared assemblies) are deployed to the global assembly cache. In the prerelease and Beta builds, use the /i option to the Alink SDK tool to install an assembly into the cache:
al /i:myDll.dll
A future version of the Windows Installer will be able to install assemblies into the global assembly cache. (More...)

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