添加button在worksheet中

1.

Shapes Object (Excel)

Reference:http://technet.microsoft.com/zh-cn/library/ff841148

2. OLEObject

3. http://stackoverflow.com/questions/4046769/how-to-programatically-create-button-on-excel-worksheet-in-c

4.这个还没有读，应该不错

http://codeidol.com/csharp/c-sharp-in-office/Using-Windows-Forms-in-VSTO/Adding-Controls-at-Runtime/

新增worksheet

http://msdn.microsoft.com/en-us/library/6fczc37s(v=vs.90).aspx

密码保护

http://stackoverflow.com/questions/1943881/how-to-check-excel-workbook-or-sheet-is-password-protected-or-not

http://msdn.microsoft.com/en-us/library/microsoft.office.tools.excel.worksheet.protect(VS.80).aspx