Comments by d2niraj (Top 4 by date)

when I said interop, it means it is as simple as referencing any dll in .Net project.

Here's the steps add dll,
-From the 'project' menu
-Select 'Add Reference'
-Select the 'COM' tab
-Select your dll and click OK

See following link
http://www.vb-helper.com/howto_net_use_vb6_dll.html

In this case you have to check for value exists while adding to drop down. If value exists then skip else add to drop down.

Use this statement:
select firstname from useretails where Convert(float,totalexperience) between 1 and 4

But i suggest to change the data type of column, if possible . As this type conversion is performance hit on every request.