Vb net combo box validating


18-Oct-2019 00:48

Although the programmer will obviously take every precaution to ensure the correct operation of the program, and will attempt to eliminate bugs that could cause a problem through a rigorous process of testing, they have no real control over mistakes made by the user during data entry.Nor can they guarantee that any data files used by the program will be free of errors and in the correct format.The Rad Combo Box can trigger validation of other controls on the form when it performs a post-back to the server.To achieve this behavior, you need to set the Causes Validation property to True.

Private Sub Combo Box3_Validating(By Val sender As Object, By Val e 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 Box3. Text & "' " com = New Ole Db Command(ewaaa, con) con. If the reader has 0 rows (Has Rows = False), the data entered doesn't exist so you can continue on and allow the database to add that entry. Selected Index Changed con = New Ole Db Connection("Provider= Microsoft. 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.

When no Validation Group is specified, all validators will execute when a post-back to the server is made.



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