Aprire un database e controllare lo stato della connessione.
		Stampa	Torna Indietro
Linguaggio: Visual Basic Net	Autore: Admin		Data Archiviazione: 08/06/2006

Imports System
Imports System.Data
Imports System.Data.OleDb
Imports System.Data.SqlClient
Imports System.Collections
Imports System.Windows.Forms
Imports System.Resources

Public Class MainClass
Shared Sub Main()
'Declare variables and objects
Dim strConnectionString As String = _
"Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=Employee.mdb;"
Dim objConnection As New OleDbConnection(strConnectionString)
Dim strSQL As String = _
"SELECT FirstName, LastName FROM Employee"
Dim objCommand As New OleDbCommand(strSQL, objConnection)
Dim objDataAdapter As New OleDbDataAdapter(objCommand)
Dim objDataTable As New Data.DataTable("Employee")
Dim objDataRow As DataRow

Try
'Open the database connection
objConnection.Open()

'Check the state of the connection and report appropriately
If objConnection.State = ConnectionState.Open Then
Console.WriteLine( "Database connection is open")
Else
Console.WriteLine("Database connection failed")
End If

Catch OleDbExceptionErr As OleDbException
'Write the exception
Console.WriteLine(OleDbExceptionErr.Message)
Catch InvalidOperationExceptionErr As InvalidOperationException
'Write the exception
Console.WriteLine(InvalidOperationExceptionErr.Message)
End Try

'Close the database connection
objConnection.Close()

'Clean up
objDataRow = Nothing
objDataTable.Dispose()
objDataTable = Nothing
objDataAdapter.Dispose()
objDataAdapter = Nothing
objCommand.Dispose()
objCommand = Nothing
objConnection.Dispose()
objConnection = Nothing

End Sub
End Class