Vb net combo box validating

Private Sub Combo Box3_Selected Index Changed(By Val sender As System. ACE.oledb.12.0; Data Source=C:\Users\edenzam\Desktop\CBFMNHS Enrollment System\CBFMNHS Enrollment System\bin\Debug\Enrollment System.accdb") Dim ewaaa As String = "SELECT * FROM Schedulings WHERE Year Levels = '" & Combo Box1. To String() & "' AND Sections = '" & Combo Box3. To String() & "'" com = New Ole Db Command(ewaaa, con) con.

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There are several third-party (Dev Express, for example) packages that provide Combo Boxes that allow you to inspect both the initial and the new values when the value changes and cancel the change if desired, but the Combo Box provided in System. While the package can be pricey, the controls themselves are very high-quality.

If all you're looking for is a Combo Box that you can cancel changes on then there are likely more economical options, but as Win Forms control libraries go, the DXperience package is one of the (if not THE) best.

If the e-mail address is not in the standard format (containing "@" and "."), the validation fails, an Error Provider icon is displayed, and the event is canceled.

This example requires that a Text Box and Error Provider control have been created on a form.

Private Sub Combo Box3_Validating(By Val sender As Object, By Val e As System. Therefore you will need to prompt the user that the record exists. Text = text Msg Box("Section Already Exist", Msg Box Style. Selected Index = -1 Else ' do nothing End If End Sub 0 rows (Has Rows = True).

Text = "'" Then" i just don't know how to manipulate combobox when the event is validating...please help me MOD EDIT: Please use code tags This post has been edited by eclipsed4utoo: 29 March 2012 - AM I'm kind of confused. I guess I would query the database for the primary column values that you don't want a duplicate of and if a row is returned, react to the current information being a duplicate. Which means that a record already exists that matches what you are looking for.

Text = rid(2) Msg Box("Section Already Exist", Msg Box Style. Selected Index = -1 End If End If End Sub i think the problem is in this part "If Combo Box3. Your query looked in the database and returned a row. Then you set the to a column value from that query result but that would then trigger the Validating event which is where this code resides.

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