如果是WebException

Question

使用以下代码：

            Dim address2 As String = "blablabla"
            Dim client2 As WebClient = New WebClient()
            Dim reader2 As StreamReader = New StreamReader(client2.OpenRead(address2))
            Dim json2 As JObject = JObject.Parse(reader2.ReadToEnd)
            If FlatLabel4.Text = "Nível: 30" Then

我希望他，如果＆＃34;远程服务器返回错误：（404）Not Found。＆＃34;，它会做某事。

我该怎么做？

感谢。