The
DateTime
structure has got a constructor overload which accepts year, month and day as arguments as explained here
DateTime Constructor (Int32, Int32, Int32)[
^]
Retrieve the year, month and day from the corresponding
ComboBox
and create a
date
as shown below
DateTime date = new DateTime(2012,3,20);
Console.WriteLine ("{0:dd-MM-yyyy}",date);
Use the date created above to save to the database