Chaching Dataset using session object

Hello, new to .Net. I would like to cache a dataset to the session object because the data is coming from a file the user will upload, which I then want to display with edit capabilities on each row the user can change that have errors I flag before submitting this information to the database.

I think I have an idea on how to accomplish this, I will wind up with the cached object that I will display by by binding it to a dataset or datalist, with an eventhandler associated with each row that will access the corresponding cached information. What I don't understand is how to access a specific column in a specific row of that cached information. So, if I had a table with four rows, containing [column1] and [columns2], how would I ask for the value of [column2] in the thrid row?

Do I need to do anything special when I set it from the datasource, like so?

Session["MyDataSet"] = CreateDataSource();

If that's all I need to do, then what is the syntax for accessing a row in this manner?

thanks in advance, I'm in a crunch here and stuck on this, very appreciative of any help on this!!!