Combo Box Data Binding

1. First complete the lesson on regular data binding and open it
2. Create a new table in Design view as follows:
    

   Column Name	Data Type	Length	Addition Properties
   GenderID	int		Set Primary Key Identity: Yes
   Gender	varchar	20	Allow Nulls: Unchecked

3. Save it as Genders and fill it up as follows:
    

   GenderID	Gender
   	Unknown
   	Female
   	Male

4. Close the table
5. Open the Persons table in Design view and, in the first empty column, create a new field as follows:
    

   Column Name	Data Type	Length	Addition Properties
   PersonID
   FirstName
   LastName
   GenderID	int

6. Save the table as Persons
7. Right-click GenderID and click Relationships...
8. Set the Primary Key Table and the Foreign Key Table fields as GenderID
    
   
9. Click Close
   You can fill out the table with a few records
    
   
10. Open the ExoADO1 application
11. Add a new combo box to the form as follows:
     

    Control Name Text Additional Properties Label   Gender:   ComboBox cboGender   DropDownStyle: DropDownList

12. To update the data source, right-click sqlDataAdapter1 and click Configure Data Adapter...
13. Click Next
14. In the Data Adapter Configuration Wizard, in the combo box, select Server.People.dbo and click Next
15. Accept the default Use SQL Statements radio button and click Next
16. Change the statement to
     

    SELECT PersonID, FirstName, LastName, GenderID FROM Persons

17. Click Next and click Finish
18. To create a data source for the combo box, from the Data section of the Toolbox, click SqlDataAdapter and click the form
19. Click Next
20. In the combo box, select Server.People.dbo and click Next
21. Accept the default Use SQL Statements radio button and click Next
22. Click Query Builder...
23. From the Tables property page of the Add Table dialog box, click Genders. Click Add and click Close
24. In the upper section of the Query Builder window, click the GenderID and the Gender check boxes
25. Click OK
26. Click Next and click Finish
27. To create a data set for the genders, right-click sqlDataAdapter2 and click Generate Dataset...
28. Accept the Existing radio button and accept the Genders check box
29. Click OK
30. On the form, click the combo box
31. In the Properties window, set the properties as follows:
    DataSource: dsPersons1.Genders
    DisplayMember: Gender
    ValueMember: GenderID
    DataBindings -> SelectedValue: dsPersons1 - Persons.GenderID
32. Double-click an empty area of the form and change the Load event as follows:
     

    private: System::Void Form1_Load(System::Object * sender, System::EventArgs * e) { sqlDataAdapter2->Fill(this->dsPersons1, "Genders"); sqlDataAdapter1->Fill(dsPersons1, "Persons"); }

33. Press Ctrl + F5 to test the application