There is no need to install Visual Studio in customer system for deployment. All you need to do is to check whether the following components are installed in customer's machine.

In case of Web Application (ASP .Net)

• .Net Framework (2.0/3.5/4.0) depending on the version with which you developed the application
• IIS Web Server
  
• SQL Server database if you have included database functionality
  

• .Net Framework (2.0/3.5/4.0) depending on the version with which you developed the application
• SQL Server database if you have included database functionality
• You can either copy the application files obtained after building the application or you can create a setup file with Deployment & Setup project in Visual Studio
  

We Can deliver a  project by two ways