How to get records by using foreign key in one table using primary key another table in Visual Basic 6.0

I have two tables in same database:

• table1 contains order_no (primary key) and cust_name
• table2 contains order_no (foreign key) (which also have duplicates entry per food item ordered in single order), table_no, items, date, cust_name and so on...

My question is: how can I show the records in listbox and datagrid or in textbox using table1's primary key order_no so I can get all the records which have assigned the foreign key with same order number in table2

I am using Visual Basic 6.0

Try something like this

Private Sub mLoadData(lOrder_no As Long)
    ' add a reference to Microsoft ActiveX Data Objects 2.8 Library
    ' add a MSHFLXGD (Microsoft Hierarchical FlexGrid) control named grData to form
    Dim rc As ADODB.Recordset
    Dim db As New ADODB.Connection
    Dim sConnString As String, sSQL As String

    'sConnString = create a connection string according to your database - https://www.connectionstrings.com/
    db.Open sConnString

    sSQL = "SELECT * FROM table2 WHERE order_no =" & lOrder_no
    Set rc = db.Execute(sSQL)
    Set grData.DataSource = rc

End Sub