Create all the rows of a column as a dropdownlist in excel.

My requirement is to export a blank excel sheet with 5 columns in which 3rd columns of all rows as a dropdownlist, so that user can use this work sheet to modify the data as per their need. I am using c# to exporting file.

I already worked on it but that at the moment, it only creates a dropdown list in a particular cell but I want to make all the rows of first column as a dropdown list .

Am using gembox spreadsheet to create an excel file.