Copy correct values from drop-down lists of Item Master Data form

Hi experts

For one of the functions of my add-on I need to copy values from a drop-list of Item Master Data from(ex: Under General tab, the value of Manufacturer).

How my function works-> User updates an item with some values(can be Item description, Foreign Name, Price List, Manufacturer,etc). Afterwards he clicks my function button included in this form. Then the function copies the changes he made and updates another item with those values. I can copy values such as Foreign Name,Item description(fields without a drop-down list) without any problem. But I can't copy the values from drop--down lists because in the database these columns have integer values.

So any help to find a solution to my issue would be highly appreciated!

My code is written in c#

Thanks in advance