修改SQLServer2008数据表，保存时提示如下警告信息：
The Save (Not Permitted) dialog box warns you that saving changes is not permitted because the changes you have made require the listed tables
to be dropped and re-created.
通常都是由于所修改的表被其它表所关联，所以会提示上面的警告信息。
通常我们会想默许这种操作，可以设置：Tools -> Options -> Designers -> Table and Database Designers -> clear the Prevent saving changes that require the table to be re-created check box.
详细内容可以参数链接如下：http://msdn.microsoft.com/en-us/library/bb895146.aspx
