Difference Between Sand Box Solution and Farm Solution

Sand Box Solution	Farm Solution
sand box solution  deploy in  content dbase	farm solution deployed in file system (hiv\template\layout)
sand box doesn't support to system.IO  Therefore you Cannot read/write to the file system.	farm solution  support to system.IO  Therefore you Can read/write to the file system.
sand box solution support to deploy as site collection  level	farm solution is used to deploy a s farm level
Visual web parts are not supported	Visual web parts are  supported
No SP Security - Therefore no Elevated Privileges  No support for SPUtility.SendEmail, So you can't Send Mails using this class.  No Server side redirects, such as Response.Redirect, Server.Transfer,  SPUtility.Redirect.	Here you can use SP Security  Here you can use SP Utillity.Send email  Here you can use redirects, like response .redirect, server.redirect, SPUtility.Redirect
You can't use SP Site object to get other site collections. (But you can use it to get current site as : SP Site onsite = SPContext.Current.Site)	Here you can use SP site object.
No Feature stapling supported.	Yes Feature stapling supported.
No Business Connectivity Services support	Yes Business Connectivity Services support