AsyncFileUpload1.OnClientUploadComplete = New EventHandler(Of AsyncFileUploadEventArgs)(**AsyncFileUpload1_UploadedComplete**)
AsyncFileUpload1.OnClientUploadError = New EventHandler(Of AsyncFileUploadEventArgs)(**AsyncFileUpload1_UploadedFileError**)
得到如下配额的错误：
“委托”System.EventHandler（Of AjaxControlToolkit.AsyncFileUploadEventArgs）'需要'AddressOf' 表达式或lambda表达式作为其唯一参数 构造函数。 “