This is a common problem when you want to do some changes over your database table; the common one : You want make the “is identity=yes” in Identity specification section.
The error screen is as below: (Saving changes is not permitted. The changes you have made require the following tables to 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.)
To solve this error; you must follow the instruction below:
Open Management studio –> Tools–>Options–>Table and database designer –> and in this area; do uncheck “Prevent saving changes that require table re-creation” part.
Click OK, and you won’t get the same error as before.