Question

String was not recognized as a valid datetime in vb.net?

Answer 1

It may be because you are converting a date which is represented as a string and is not on the standard date format. Ex,

Dim _dateString As String = "22-2009-11"
Dim _date As DateTime = = DateTime.Parse(_dateString);

throws an exception because _dateString is non-standard date format. The best thing you will do is to use DateTime.ParseExact

Dim _dateString As String = "22-2009-11"
Dim _date As DateTime =  DateTime.ParseExact(_dateString,"dd-yyyy-MM",CultureInfo.InvariantCulture);