checkbox inside gridview checkchanged event not firing

Question

 protected void grdManageAgent_RowDataBound(object sender, GridViewRowEventArgs e)

    {

        if (e.Row.RowType == DataControlRowType.DataRow)

        {

            CheckBox chkSelect = (CheckBox)e.Row.Cells[0].FindControl("chkCheck");             

            if(chkSelect!=null)

            chkSelect.CheckedChanged += new EventHandler(chkSelect_CheckedChanged);

        }

    }

    void chkSelect_CheckedChanged(object sender, EventArgs e)

    {

        SaveCheckedValues();

    }