# Concatenating CSV

If you have some comma separated values that you want to concatenate in Keyfax then there is an expression you can use to do that. For example you may have `TenantID` made up from several values.

If you wanted to combine three comma separated values you can use the following [csv](https://docs.keyfax.biz/product-suite/admin/databox-expressions/text-expressions/csv "mention") expression as shown below\....

* `csv(1) & csv (ds, 2) & csv (ds, 3)`

You can see this in action via the expression tester as shown below\...

<figure><img src="https://2882349412-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MARm6St_qFGM52R3pBa%2Fuploads%2F9CM0dDgVwvK7VJJcSp5J%2Fimage.png?alt=media&#x26;token=311bd6be-cf38-4b15-a27e-e628e0b33feb" alt=""><figcaption></figcaption></figure>

You can see that the value 10002435,44653,3323 has been concatenated to read 10002435446533323