void LoadTK()
{
taiKhoanBindingSource.DataSource = TaiKhoanBUS.GetAllTK();
comboBoxUser.DataSource = TaiKhoanBUS.GetAllTK();
comboBoxUser.DisplayMember = "UserName";
comboBoxUser.ValueMember = "UserName";
comboBoxMaCHUser.DataSource = CuaHangBUS.GetAllCuaHang();
comboBoxMaCHUser.DisplayMember = "TenCuaHang";
comboBoxMaCHUser.ValueMember = "MaCuaHang";
comboBoxLoaiTK.DataSource = LoaiTaiKhoanBUS.GetAllLoaiTaiKhoan();
comboBoxLoaiTK.DisplayMember = "TenLoaiTK";
comboBoxLoaiTK.ValueMember = "MaLoaiTK";
}