使用C＃在Excel中生成多个工作表

I need to produce a C# program which will create two intro worksheets, and a 3rd worksheet that will be made repeatedly for every entry in a database. I am unsure which is the best way to produce multiple worksheets. This last sheet must be able to retain some formating and range names. Is copying this last sheet better, or is creating a new worksheet better? I need to produce a C# program which will creat