how to get the specific column value from viewdata?

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ASP.NET

MVC

I selected a row from DB.

the data look like this

-------------------
productid |  Qty
-------------------
  123     |   12

I put this in ViewData.

ViewData["viewtest"] = selected data from above. (productid:123, qty:12)

on the View, I like to get only the qty value from the viewdata.
what kind of syntax should I use for that?

I keep thinking about datatable or dataset from asp.net..
So I tried ViewData["viewtest"][0]["qty"]... and so on which never works..

I have to bring the two values (productid and qty) at the same time and split the value from the view..

can anybody help???

thank you in advance.