how to modify data in a DetailsView Databound event

Question

I'm using a detailsview with an sqldatasource in the aspx page. I'm trying to do some pre and post processing on some of the fields - basically to convert a html list to a newline separated list for editing and back to html to store in the database.

The post-processing in ItemUpdating is easy enough but the pre-processing in DataBound is messy...

      protected void DetailsView1_DataBound(object sender, EventArgs e)
        {
            if (DetailsView1.Rows.Count > 2)
            {
                string s =((DataRowView)DetailsView1.DataItem).Row.ItemArray[2].ToString();


                TextBox box1 = (TextBox) DetailsView1.FindControl("textbox1");
                if (box1 != null)
                {
                    box1.Text = preprocess(s);
                }
           }
      }

Its the fragility of

string s=((DataRowView)DetailsView1.DataItem).Row.ItemArray[2].ToString();

that upsets me. I'm sure I am missing something (more than one thing) obvious!

I guess I was hoping to do something more like my ItemUpdating...

e.NewValues["threeline"] = postprocess(e.NewValues["threeline"].ToString());