Q: How to implement Multi-threading?
A: 
1. Simple

Module Module1

    Sub Main()
        For i As Integer = 1 To 10
            ' create a thread and run
            Dim obj As New Threading.Thread(AddressOf ThreadMethod)
            obj.Start()
        Next
        Console.ReadLine()
    End Sub

    ' the running method in every thread
    Sub ThreadMethod()
        Console.WriteLine(Now)
    End Sub
End Module

2. With Parameters : add Sub() before the method in Thread object initialization

Dim obj As New Thread(Sub() SaveImage(url, mFileName))
obj.Start()

...

    Public Sub SaveImage(url As String, mFileName As String)
        'Public Sub SaveImage()
        'Dim url As String, mFileName As String
        Dim objWebClient As New WebClient

        objWebClient.DownloadFile(url, mFileName)
        Console.WriteLine(url)
    End Sub

ASP.net Menu 在 IE9、Google Chrome、FireFox 內執行出現空白

Q: ASP.net Menu 在 IE9、Google Chrome、FireFox 內執行，下拉式選單出現空白
A: 在母版網頁的內加一行如下：

or