Hi.
I'm trying to strip the date part from a DateTime object and store it with a generical date (1900/1/1) in the database field 'day_start' (datetime). I've used the ORM designer in VS 2008 to make the linq to sql bindings and it has generated the default: Dataclasses.designer.cs c# code for me. There I create a new partial method which fires whenever day_start changes, but it seems that changes to the method parameter 'value' don't get save in the following set method of the Property 'day_start'.

Essentialy I have the following method in the Dataclasses.designer.cs:

partial void Onday_startChanging(DateTime? value)
    {
        if (!value.HasValue)
            return;
        DateTime newval = new DateTime(1900,1,1);
        TimeSpan ts = new TimeSpan(value.Value.Hour, value.Value.Minute, 0);
        newval.Add(ts);
        value = newval;
        System.Web.HttpContext.Current.Trace.Write("time: " + value.Value.ToShortDateString() + " " + value.Value.ToShortTimeString());
    }

 Which gets fired. But value doesn't get saved with its new value (1900/1/1 + whatever hour is contained in the DateTime object).

What am I doing wrong?

Best Regards

Alek

You are using DateTime.Add which returns a new date time, it doesn't "Add" it the the instance. So this line:

newval.Add(ts);

Should be:

newval = newval.Add(ts);

Hi.

I did change the code so it looks like the following:
 

if (!value.HasValue) 
            return; 
DateTime newval = new DateTime(1900, 1, 1); 
TimeSpan ts = new TimeSpan(value.Value.Hour, value.Value.Minute, 0); 
value = newval.Add(ts);