SharePoint 2010 Feature: Sandboxed Solution

SharePoint 2010 introduces new feature called Sandboxed Solutions. These sandboxed solutions are nothing but .wsp packages which has limited access to resources and runs isolated alongside other processes. Sandboxed solutions will not be able to make updates beyond the scope of the current site. You are also limited in performing farm level and web application level changes.
But Why Sandboxed Solutions?
Today, in SharePoint Server 2007, solutions are deployed in the farm level though you can activate features per web application or site. There is no proper way you can centrally manage/administer these solutions in a shared environment per web application or site. With sandboxed solutions, administrators can now allocate quotas, monitor the usage and also prevent excessive usage of resources by the solution. But yes, you are limited in the functionality what the solution can access, but as long as the solution scope is not beyond the site level, it is always better to build sandboxed solutions.
Surprisingly, Sandboxed solutions are going to play a major role in Microsoft Online Services very soon :)
Building a Sandboxed Solution
Building a Sandboxed solution is as simple as building a normal SharePoint application (Web Part, User Control etc.,).
Refer the following MSDN Article to find out more about Sandboxed Solutions. From MSDN:
The following capabilities and elements are available in sandboxed solutions:
The following capabilities and elements are not available in sandboxed solutions:
  • Custom Action groups
  • HideCustomAction element
  • Content Type Binding
  • Web Application-scoped Features
  • Farm-scoped Features

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