I tried to create an application page in SharePoint 2013 by using Visual Studio, The page was created but, I don't know where it's created in SharePoint?
And I need to create it in Sub-site Pages library?
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Application pages get created in Layout folder 15 hive.
Following is the path of Layout folder
C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\TEMPLATE\LAYOUTS
If you want to create page in pages folder, you have to use module element. Following is sample code.
<Module Name="Name" Url="Pages" Path="PathInSolution"> <File Url="Name.aspx" Type="GhostableInLibrary" IgnoreIfAlreadyExists="FALSE" Path="Name.aspx" Level="Published" ReplaceContent="TRUE"/>