String Was Not Recognized As A Valid DateTime / Unknown Word Starting At Index 0?

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SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString);
conn.Open();
string date = Convert.ToString(ddlYear.SelectedItem.Value) + "/" + Convert.ToString(ddlMonth.SelectedItem.Value) + "/" + Convert.ToString(ddlDate.SelectedItem.Value);
DateTime dt = Convert.ToDateTime(date);
// ddlYear.SelectedValue + "/" + ddlMonth.SelectedValue + "/" + ddlDate.SelectedValue
SqlCommand cmd = new SqlCommand(@"insert into OnlineBookingEvent(BookingEvent,BookeventDate,cdt,udt)values
(@BookingEvent,@BookeventDate,@cdt,@udt)", conn);
cmd.Parameters.AddWithValue("@BookingEvent", ddlEventName.DataValueField);
cmd.Parameters.AddWithValue("@BookeventDate",dt);
cmd.Parameters.AddWithValue("@cdt", System.DateTime.Now);
cmd.Parameters.AddWithValue("@udt", System.DateTime.Now);
cmd.ExecuteNonQuery();

Posted 11-Nov-13 8:09am

Member 10386021

Updated 18-Jan-20 1:05am

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OriginalGriff · Answer 1 · 2013-11-11T08:17:00

If you have a Value to each of your drop down lists which is numeric, why are you building it into a DateTime by such a roundabout method? Why do conversions which are dependant on the current system settings (which you don;t reference or check) by building a string at all?

Instead try:

C#

DateTime dt = new DateTime((int) ddlYear.SelectedItem.Value, (int) ddlMonth.SelectedItem.Value, (int) ddlDate.SelectedItem.Value);

That way, there is no strings, not interpretation - just clarity (and more readable code to boot)?

Marla **Sukesh** · Answer 2 · 2013-11-11T08:31:00

Convert.ToDateTime considers your system datetime format.

For instance lets say your machine date time format is "dd/MM/yyy" and your string contain date time in "yyyy/MM/dd" you will get above error.

Either change system date time format.
Or change Application DateFormat using following code and then execute above code

CultureInfo current = Thread.CurrentThread.CurrentCulture.Clone() as CultureInfo;
DateTimeFormatInfo ObjPriDateTimeFormat = DateTimeFormatInfo.CurrentInfo.Clone() as DateTimeFormatInfo;
ObjPriDateTimeFormat.ShortDatePattern="yyyy/MM/dd";
current.DateTimeFormat = ObjPriDateTimeFormat;
Thread.CurrentThread.CurrentCulture = current;

String Was Not Recognized As A Valid DateTime / Unknown Word Starting At Index 0?

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