public DataTable showdata() { return(cnn.executeShowQuery("SELECT MaL, TenL, NienKhoa FROM [Lop]")); }
public DataTable showdata() { return(cnn.executeShowQuery("SELECT MaGV, TenGV FROM [GiaoVien]")); }
public DataTable showdata_Lop() { return(cnn.executeShowQuery("SELECT MaL, TenL FROM [Lop]")); }