vb.net中split的疑问

Public Class SplitTest
    Public Shared Sub Main()
        Dim words As String = "This is a list of words,with: a bit of punctuation" + _
                              vbTab + "and a tab character."
        Dim split As String() = words.Split(New [Char]() {" "c,","c,"."c,":"c,CChar(vbTab) })

        For Each s As String In  split
            If s.Trim() <> "" Then
                Console.WriteLine(s)
            End If
        Next s
    End Sub 'Main
End Class 'SplitTest
' The example displays the following output to the console:
'       This
'       is
'       a
'       list
'       of
'       words
'       with
'       a
'       bit
'       of
'       punctuation
'       and
'       a
'       tab
'       character

两个问题：

1、dim a( ) as string
dim a as string( )
两者有啥区别？





2、split后面的成员列表是分隔符的列表么？只见过一个分隔关键字的，没见过多个的，有知道的么？

    {" "c,CChar(vbTab) }

这几个成员是什么意思？ 其中的c又是什么意思？