Merge cells and give border to the cell in Excel sheet using c#.net

hi

I am having a excel template and i am writing the content to the cells in the excel using excel object in c#.

I am writing the excel by specifying the row and column number and the content to write on the corresponding position.

I need the following to be done.

                   - I need to provide the border to each and every cell i am writing.

                   -After writing all the content in the excel, after that i need to merge the last three cells

and write some content over there.

Hope this  is clear.

Please let me know if this is not clear.