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Overview and Difference between Sandboxed solution and Farm solution

When you compile a SharePoint solution, it deploys to the SharePoint server and a debugger attaches to debug it. The process used to debug the solution depends on the setting of the Sandboxed Solution property: sandboxed solution or farm solution.

For more information, see Sandboxed Solution Considerations.

Farm solutions, which are hosted in the IIS worker process (W3WP.exe), run code that can affect the whole farm. When you debug a SharePoint project whose Sandboxed Solution property is set to "farm solution," the system's IIS application pool recycles before SharePoint retracts or deploys the feature so as to release any files locked by the IIS worker process. Only the IIS application pool serving the SharePoint project's site URL is recycled.

In this solution all SharePoint project item types in are available, but deployment needs administrative privileges and the solution must run in FULL TRUST permission LEVEL.

Sandboxed solutions, which are hosted in the SharePoint user code solution worker process (SPUCWorkerProcess.exe), run code that can only affect the site collection of the solution. Because sandboxed solutions do not run in the IIS worker process, neither the IIS application pool nor the IIS server must restart. Visual Studio attaches the debugger to the SPUCWorkerProcess process that the SPUserCodeV4 service in SharePoint automatically triggers and controls. It is not necessary for the SPUCWorkerProcess process to recycle to load the latest version of the solution.

Run in a secure, monitored process. Sandboxed solutions can be deployed without requiring SharePoint administrative privileges. If you choose a sandboxed solution, you can only use project item types that are valid in sandboxed solutions.

With either solution type, Visual Studio also attaches the debugger to the browser to enable client-side script debugging. Visual Studio uses the script debugging engine for this purpose. To enable script debugging, you must change the default browser settings when you are prompted.

Visual Studio attaches the debugger only to the W3WP or SPUCWorkerProcess processes running the current site. Visual Studio also attaches the managed COM Plus and workflow debugging engines.


Which solution needs to select?
Sandbox solution is best because of following reasons.
· It will deployed at the site collection level rather than the farm level, so it allows us to this lets you separate a solution so it is only offered to one site collection within the farm.
· Sandboxed solutions also run in a separate process from the main SharePoint IIS web application process, and the separate process is throttled and monitored with quotas to guard the SharePoint site from becoming unresponsive due to a misbehaving sandboxed solution.
· Users can deploy solutions not including requiring administrator agreement

Many useful features provide by Sandboxed solution then why we need Farm Solution?
If Code requirements to run at the Web Application of Farm Level or talk with multiple site collection, in that case we should go for Farm Solution
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