fix sql server error occur : “Saving changes is not permitted. The changes that you have made require the following tables to be dropped and re-created. You have either made changes to a table that can’t be re-created or enabled the option Prevent saving changes that require the table to be re-created”

answer : Tool bar of SQL Server 2008 choose Tools >> Options >> Designers
uncheck “Prevent saving changes that require table re-creation”