课程信息查询

查询功能代码（包括普通查询和全部查询）：protected void Button2_Click(object sender, EventArgs e) { DataSet ds = new DataSet(); DataBS(ds, strsql); GridView1.DataSource = ds.Tables["table"]; GridView1.DataBind(); DropDownList1.SelectedValue = "不限"; DropDownList2.Select