int rowindex;
        foreach (GridViewRow gvr in gv.Rows)
        {
            System.Web.UI.WebControls.CheckBox cb = new CheckBox();  //定义一个控件
            cb = (CheckBox)gvr.FindControl("CheckBox1");                               //找到一个控件并把值给新定义的控件
            if (cb.Checked)
            {
                rowindex = gvr.RowIndex;
                DataKey key = gv.DataKeys[rowindex];

                string Handicaps = key.Value.ToString();
                handicaps.Value = handicaps.Value.ToString().Trim() + Handicaps + "|";
              
            }
        }