.NET, ASP.NET, C#, VB.NET, SQL Server, WPF, XAML

ASP.NET Compilation tool is used to compile an ASP.NET Web application either in same machine or to deploy on a target machine such as a production server. It helps application performance because end users do not encounter a delay on the first request to the application while the application is compiled on backend.
  
Compilation for deployment can be in one or two ways

That removes all files such as code-behind and markup files
That retains markup files.
 Syntax 
aspnet_compiler  [-?]
                 [-m metabasePath | -v virtualPath [-p physicalPath]]
                 [[-u] [-f] [-d] [-fixednames] targetDir]
                 [-c]
                 [-errorstack]
                 [-nologo]
                 [[-keyfile file | -keycontainer container ] [-aptca] [-delaysign]]
  
Example

Aspnet_compiler -v /WebApp1 -p "c:\MyProjects\WebApp1" -keyfile "c:\MyProjects\KeyWebApp1.sn" -apt