My customer needs to schedule some tasks with ASP .NET.
I need to save a "Start date" and an "Interval", stored respectively as date (DateTime) and long (TimeSpan.Ticks) in my database.

Editing ticks values is not exactly what my customer expects, so I binded the proper MetaColumn, to the proper UIHint.
After a few tests, I noticed how my GUI was - working, but - not easy to understand as I was expecting.
I decided to deeply customize the FieldTemplateUserControl, to display and save all needed information (Start Date, Start Time, Occours - Daily, Weekly, Monthly.., etc...).

The solution it's really simple, but there are few points you may need to find out:

How to retrieve values (Schedule_EditField.ascx.cs):

    protected override void OnDataBinding(EventArgs e)
    {
        base.OnDataBinding(e);

        DateTime? startFrom = (DateTime?)Eval("StartFrom");
        long? timeIntervalTicks = (long?)Eval("TimeInterval");
        DateTime? lastExecution = (DateTime?)Eval("LastExecution");
    }

How to store values

    protected override void ExtractValues(IOrderedDictionary dictionary)
    {
            dictionary["StartFrom"] = ...; // your logic here
            dictionary["TimeInterval"] = ...; // your logic here
    }