GridView翻页时保持CheckBox选择状态

//定义翻页bool
1private bool changed=false;
//定义保存选择项主键集合属性
1protected List<string> SelectedItems
2private void GetSelectedItem()
2protected void gvwResult_DataBinding(object sender, EventArgs e)
2protected void gvwResult_RowDataBound(object sender, GridViewRowEventArgs e)
2protected void btnConfirm_Click(object sender, EventArgs e)
2 {
3 if(!changed)
4 GetSelectedItem();
5 foreach (string id in (List<string>)this.SelectedItems)
6 {
7 //..
8 }
9 }