private void fSuaKyThi_Load(object sender, EventArgs e)
{
//combo box LoaiKyThi
_dtloaikythi = _objloaikythibus.GetAllLoaiKyThi();
cbbLoaiKyThi.DataSource = _dtloaikythi;
cbbLoaiKyThi.ValueMember = "MaLoaiKyThi";
cbbLoaiKyThi.DisplayMember = "TenLoaiKyThi";
cbbLoaiKyThi.SelectedIndex = -1;
//combobox LoaiDeThi
_dtloaidethi = _objloaidethibus.GetAllLoaiDeThi();
cbbLoaiDeThi.DataSource = _dtloaidethi;
cbbLoaiDeThi.ValueMember = "MaLoaiDeThi";
cbbLoaiDeThi.DisplayMember = "TenLoaiDeThi";
cbbLoaiDeThi.SelectedIndex = -1;
//combobox PhongHoc
_dtphonghoc = _objphonghocbus.GetAllPhongHoc();
cbbPhongThi.DataSource = _dtphonghoc;
cbbPhongThi.ValueMember = "MaPhong";
cbbPhongThi.DisplayMember = "TenPhong";
cbbPhongThi.SelectedIndex = -1;
//combobox LopHoc
_dtlop = _objlopbus.GetAllLop();
cbbLop.DataSource = _dtlop;
cbbLop.ValueMember = "MaLop";
cbbLop.DisplayMember = "TenLop";
cbbLop.SelectedIndex = -1;
LoadData();
dgvDSKyThi.RowHeadersVisible = false;
}