visible true of some checkboxes in c#

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
       {
           if (e.Row.RowType == DataControlRowType.DataRow)
           {
               CheckBox chk = e.Row.FindControl("CheckBoxID") as CheckBox;
               string someValue = DataBinder.Eval(e.Row.DataItem, "SomeCOlumn").ToString();
               chk.Checked = false;
               if (someValue == "someCheck")
               {
                   chk.Checked = true;
               }
           }
       }