Data Type VB.Net Tutorial

Module Tester
   Sub Main()
      Dim letters As String = "abcdefghijklmabcdefghijklm"
      Dim searchLetters As Char() = New Char() {"c"c, "a"c, "$"c}
      Console.WriteLine("Last occurrence of ""c""," & _
         " ""a"" or ""$"" is located at " & _
         letters.LastIndexOfAny(searchLetters))
      Console.WriteLine("Last occurrence of ""c"", ""a"" or " & _
         """$"" is located at " & _
         letters.LastIndexOfAny(searchLetters, 1))
      Console.WriteLine("Last occurrence of ""c"", ""a"" or " & _
         """$"" is located at " & _
         letters.LastIndexOfAny(searchLetters, 25, 5))
      
      End Sub 
End Module
Last occurrence of "c", "a" or "$" is located at 15
Last occurrence of "c", "a" or "$" is located at 0
Last occurrence of "c", "a" or "$" is located at -1