Error - “Specified cast is not valid” in LINQ when DateTime field is null


You are trying to convert a non-standard format, so use this:

 Try using DateTime.ParseExact.

  string dateStr = "15/07/2001";

 DateTime date = DateTime.ParseExact(dateStr, "dd-MM-yyyy HH:mm:ss",      System.Globalization.CultureInfo.InvariantCulture);

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