全选复选框

    <script language="javascript">
       function SelectAll(tempControl)
       {
           //将除头模板中的其它所有的CheckBox取反

            var theBox=tempControl;
             xState=theBox.checked;   

            elem=theBox.form.elements;
            for(i=0;i<elem.length;i++)
            if(elem[i].type=="checkbox" && elem[i].id!=theBox.id)
             {
                  if(elem[i].checked!=xState)
                        elem[i].click();
            }
  }  
  </script>

<asp:CheckBox ID="check_all" runat="server" onclick="javascript:SelectAll(this);" Text="全选" />

for (int i = 0; i < GridView1.Rows.Count; i++)  //通过复选框对选定的行进行操作
        {
            CheckBox cb = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");  //在当前搜寻当前控件
            if (cb.Checked)
            {
                int id = int.Parse(GridView1.DataKeys[i].Value.ToString());       //获取一个控件值
                string sqlstr = "delete from pinglun where postID="+ id + "";
                Class1.ExecSql(sqlstr);

            }

        }