Connection 对象的事件

一. InfoMessage   当连接从数据源处接收到一个信息性消息时被触发.
    在 SQL Server 中,允许通过 Print 命令向客户端发送消息, 这些消息不会做为错误而返回, 也不会在查询的结果之中.

范例:
Dim strConn as string = ""
Dim cn as New OleDbConnection(strConn)

AddHandler cn.InfoMessage, Addressof cn_InfoMessage

cn.Open()
With cn.CreateCommand()
    .CommandText = "Print 'This test message'"
    .ExecuteNonQuery()
End With

Public Sub cn_InfoMessage(ByVal Sender as Object, ByVal e as System.Data.oledb.oledbInfoMessageEventArgs)
    Console.WriteLine("InfoMessage event occurred")
    Console.WriteLine(vbTab & "Message received:" & e.Message)
End Sub