看到下面的e.Row.Cells[3].Text，为什么是e.Row.Cells[3].Text而不是e.Row.Cells[2].Text？？？这里是什么意思？

 if (e.Row.RowType == DataControlRowType.DataRow)
        {
            string TmpStr = Pf.GotExclusiveData("select F_ImagePic from T_PRODUCT_IMAGE where F_PdutID=" + e.Row.Cells[1].Text.Trim());
   if (TmpStr!="")
   {
    TmpStr = "../../"+ TmpStr;
    e.Row.Cells[1].Text = "<img src=" + TmpStr + ">";  
   }
   else
   {
    e.Row.Cells[1].Text = "";  
   }
           
            e.Row.Cells[3].Text = Pf.GotExclusiveData("select F_CateName from T_PRODUCT_CATEGORY where F_ID=" + e.Row.Cells[3].Text.Trim());
        }