get a Telerik Radgrid column value?

Question

I am trying to do a foreach loop through every Radgrid row. If the column value is an 'N' I change the image icon, if it is a 'P' I change the ImageURL to point to another Icon.

Unfortunately I have tried a few things but I cannot get the strTranslationValue Column value.

How is it done?

List<AppFile> fileList = GetFileList();
grdFiles.DataSource = fileList != null ? fileList : (object)string.Empty;
grdFiles.PageSize = fileList.Count;
grdFiles.DataBind();

foreach (GridDataItem item in grdFiles.Items)
{
      string strTranslationValue = item.GetDataKeyValue("sComment").ToString();
      Image iconComment = (Image)item.FindControl("translationImg");
      iconComment.ImageUrl = "~/images/approved_icon.png";
}

Update: Trying to use ItemDataBound event..

protected void grdFiles_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
{
    if (e.Item.DataItem  is AppFile) {
        GridItem gItem = (GridItem)e.Item;
        string strTranslationValue = gItem["sComments"].Text;
    }
}