Thank you for reply!

from onrowdatabound event

here is

protected void gvHrEmploye_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            int diaidi = Convert.ToInt32(gvAll.DataKeys[e.Row.RowIndex].Value);
            int rowindx = e.Row.RowIndex + 1;


            e.Row.Attributes.Add("onmouseover", "tooltip.BeginShowToolTip(event," + diaidi + "), onGridViewRowSelected('" + rowindx.ToString() + "'), clearTimeout(rowHighLightTimeOut)");
            e.Row.Attributes.Add("onmouseout", "tooltip.Hide(), rowHighLightTimeOut = setTimeout(function () { curSelRow.style.backgroundColor = '#ffffff' }, 1000);");
            
        }

        
    }