protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
CourseTableBLL ctBLL = new CourseTableBLL();
ClassBLL classBLL = new ClassBLL();
CourseBLL courBLL = new CourseBLL();
TeacherBLL teachBLL = new TeacherBLL();
DropDownList_class.DataSource = classBLL.getAll();
DropDownList_class.DataTextField = "name";
DropDownList_class.DataValueField = "ID";
DropDownList_class.DataBind();
DropDownList_course.DataSource = courBLL.getByClassId(DropDownList_class.SelectedValue);
DropDownList_course.DataTextField = "name";
DropDownList_course.DataValueField = "ID";
DropDownList_course.DataBind();
string filterTeacher = "classID='" + DropDownList_class.SelectedValue + "' and courId='" + DropDownList_course.SelectedValue + "'";
DataTable tempDt = PageUtil.getProcessedDataTable(ctBLL.getAll().Tables[0], filterTeacher, null, false);
DataView dv = tempDt.DefaultView;
tempDt = dv.ToTable(true, "teachID");
foreach (DataRow dr in tempDt.Rows)
{
Teacher teacher = teachBLL.get(dr["teachID"].ToString());
DropDownList_teacher.Items.Add(new ListItem(teacher.Name, teacher.Id));
}
bind();
}
}