[vb.net] parsing string v date

Hej

Rad bi pretvoril nek string v date.

Primeri:

1)
Dim _test_1 As String = "29/2/2000" 'NE DELA
Dim dtDate1 As Date = Date.ParseExact(_test_1, "dd/MM/yyyy", Nothing).ToString()

2)
Dim _test_2 As String = "29/02/2000" 'NE DELA
Dim dtDate2 As Date = Date.ParseExact(_test_2, "dd/MM/yyyy", Nothing).ToString()

3)
Dim _test_3 As String = "29/2/2000" 'NE DELA
Dim dtDate3 As Date = Date.ParseExact(_test_3, "dd/M/yyyy", Nothing).ToString()

4)
Dim _test_4 As String = "29-2-2000" 'NE DELA
Dim dtDate4 As Date = Date.ParseExact(_test_4, "dd-MM-yyyy", Nothing).ToString()

5)
Dim _test_5 As String = "29-02-2000" 'DELA
Dim dtDate5 As Date = Date.ParseExact(_test_5, "dd-MM-yyyy", Nothing).ToString()

6)
Dim _test_6 As String = "29-2-2000" 'DELA
Dim dtDate6 As Date = Date.ParseExact(_test_6, "dd-M-yyyy", Nothing).ToString()

Ne vem, kako bi naredil, da bi mi delal 1) primer?