Hi Max,

Thanks for your post.

Based on my understanding, you want to push the modified control data into
the datasource.

First, I am not sure when you want to do this. .Net winform databinding is
a 2 way databinding, whenever you changed the control data, and when you
leave this control, winform databinding will automatically update the
datasource for you.

Second, I do not think the updating work can be controlled in BindingSource
class. The UI control should take charge of this. Can you show me which
control you want to do this?

Below is how to update the TextBox data to the datasource:
"4.22 I programatically change a bound TextBox value, but the value does
not get pushed back into the bound datasource. How can I make sure the
DataSource is updated?"
http://64.78.52.104/FAQ/WinForms/FAQ_c43c.asp#q1017q

Hope this helps!

Best regards,
Jeffrey Tan
Microsoft Online Partner Support

Hi,

I agree with Jeffrey Tan that there probely aren't many reasons you need to
do this.   Expecially if your Control has changed then the last pending
change can be pushed using BindingSource.EndEdit().

But if you really want, you can (in NET2.0) force all values to be pushed to
the DataSource using:

foreach (Binding b in YourBindingSource.CurrencyManager.Bindings )
 b.WriteValue();

HTH,
Greetings

Thank you Jeffrey and Bart for help.

Here is why you need to force data from control back to the underlying data:

Scenario 1) BindingSource is in AddNew mode and you have a DateTime picker
in your form. The datetime picker show a date value, but underlying data
will have NULL value even after EndEdit. I cannot tell user to click on
datetime picker and choose the same date value.

Scenario 2) Similar to scenario 1, but you are using a data bound drop down
combobox. ** combobox's DropDownStyle must be in DropDownList mode.

Your combobox has no item in it. You force the BindingSource to AddNew mode.
Then one items to combobox. The underlying data for combobox is still NULL!!

Essentially, When your BindingSource is in AddNew mode, and you have bound
controls that cannot show NULL values, then it involves all messes around
the world!!

Does that make any sense to you?

Max