SELECT A GRIDVIEW CELL IN ASP

How could I select only one gridview cell in asp.

if (e.Row.RowType == DataControlRowType.DataRow)
{
     e.Row.Attributes.Add("onMouseOver", "this.style.cursor = 'pointer' ");
     e.Row.Attributes.Add("onclick", Page.ClientScript.GetPostBackEventReference(gv_bus, "select$"+e.Row.RowIndex.ToString()));
}

I found this code, just select the whole row. I would like to know the column and the row.