asp.net中gridview的checkbox使用总结

                   <asp:TemplateField HeaderText="选择">
                       <ItemTemplate>
                           <asp:CheckBox id="checkboxid" runat="Server"/>
                       </ItemTemplate>
                   </asp:TemplateField>            

        protected void checkboxcheck_Click(object sender, EventArgs e)
        {
            for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
            {
                CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("checkboxid");
                if (cbox.Checked == true)
                {
                    udal.alreadyExam(int.Parse(GridView1.DataKeys[i].Value.ToString()), int.Parse(GridView1.DataKeys[i].Value.ToString()));
                }
            }
            GridView1.DataBind();
        }

protected void 全选_CheckedChanged(object sender, EventArgs e)
        {
            for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
            {
                CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("checkboxid");
                if (checkboxbutton.Checked == true)
                {
                    cbox.Checked = true;
                }
                else
                {
                    cbox.Checked = false;
                }
            }
        }