Module Module1
Sub Main()
Dim list As New List(Of Integer)
list.Add(1)
list.Add(43)
list.Add(7)
list.Add(85)
list.Add(999)
Dim i As Integer = list.IndexOf(7)
If (i <> -1) Then
Console.WriteLine("found")
Else
Console.WriteLine("not found")
End If
i = list.IndexOf(222)
If (i <> -1) Then
Console.WriteLine("found")
Else
Console.WriteLine("not found")
End If
End Sub
End Module
' run:
'
' found
' Not found