private void GridViewBind()
{
string searchinfo = this.DropDownList1.Text;
if (searchinfo == "未还书")
{
GridView1.DataSource = MyUtils.AllUserNowBorrow();
GridView1.DataBind();
}
else if (searchinfo == "已还书")
{
GridView2.DataSource = MyUtils.AllUserHisBorrow();
GridView2.DataBind();
}
}