Nullable DateTime with SQLDataReader [duplicate]

Answer 1

Can you please tell us exactly which line is throwing the error while debugging. It would be easier.

if (! reader.IsDBNull(reader.GetOrdinal("STARTINGDATE"))) {
    obj.startingDate = reader.GetDateTime(reader.GetOrdinal("STARTINGDATE"));
}

no need to explicitly assign null if it is DBNull, because it is a nullable type so by default it will contain null.

Ok, as per your updated code (note the comments):

while (reader.Read()) {
    dtl = new DetailsClass((reader.GetInt32(reader.GetOrdinal("MEMBERSHIPGEN"))),

    // here you are checking null for email
    reader.IsDBNull(1) ? null : reader.GetString(reader.GetOrdinal("EMAIL")),

    // here you are not checking null for startingdate ?
    reader.GetDateTime(reader.GetOrdinal("STARTINGDATE")));
    details.Add(dtl);
}

Lets try it in more verbose way:

while (reader.Read()) {

    dtl = new DetailsClass();

    dtl.membershipgen = reader.IsDBNull(reader.GetOrdinal("MEMBERSHIPGEN")) ? null : reader.GetInt32(reader.GetOrdinal("MEMBERSHIPGEN"));
    dtl.email = reader.IsDBNull(reader.GetOrdinal("EMAIL")) ? null : reader.GetString(reader.GetOrdinal("EMAIL")),
    dtl.startingdate = reader.IsDBNull(reader.GetOrdinal("STARTINGDATE")) ? null : reader.GetDateTime(reader.GetOrdinal("STARTINGDATE")));

    details.Add(dtl);
}