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if (Session["name"] == null || Session["username"] == null)
{
Response.Redirect("~/#.cshtml");
}
var id = Request.QueryString["id"];
var db = Database.Open("ctXueji");
var list = "select *from classes inner join majors on classes.majors_id = majors.id inner join teachers on classes.teachers_id = teachers.id where classes.id ="+id;