如何在vb中生成log日志

Public Function writeText(ByVal str As String) '
        Try
            str &= ControlChars.CrLf
            Dim fStream As FileStream
            Dim sFileName As String
            sFileName = Application.StartupPath & "\login.log"

            fStream = New FileStream(sFileName, FileMode.Append)
            Dim bWrite() As Byte = System.Text.Encoding.Default.GetBytes(str)
            fStream.Write(bWrite, 0, bWrite.Length)
            fStream.Flush()
            fStream.Close()
            fStream = Nothing
        Catch ex As Exception
        End Try
    End Function
這個就可以寫日誌了！

vb中是否有专用log日志的包，或者方法？？