issue in exporting data in existing excel without header col

Question

Hi all,

 

 I am developing a web project in which i have to export data from sql database to an existing excel 2007 file now problem is my excel file is not having any header and top 4-5 rows is occupied with some merged texts so how can i export my datatable to this excel. i also have to export two tables in two different sheets of this excel file.

 

Please help me to get out  of this.

Thanks in advance..

--darshan bhatt