How to create a foor-loop for cell range?

[ljCharlie]

I'm new to programming actions in Excel so please forgive me if my question sounds simple or stupid.

I'm using VSTO since I already have Visual Studio 2008. I'm also using C# instead of VB. I already have my range named. I guess what I need is to know some of the range properties. I need a way to write a for-loop to go through each row in the ID column and compare that to another column full of IDs too. So basically something like this:

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I'm not sure if the above pseudo code makes any sense but that's essentially what I'm trying to do.

Any help is much appreciated.